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SOHC.co.uk Forums => CB750 => Topic started by: MarkCR750 on August 04, 2017, 07:25:16 PM

Title: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 04, 2017, 07:25:16 PM
Well after a mere 3.5k miles, she's finally missed a beat 👀, just rode 14 miles, stopped in Ashbourne market place and it stalled, pressed the starter, turning over merrily but not a hint of starting, tried several times, nowt, held the throttle wide open and she fired up, now ridden 10 miles and stopped for a drink, I'm leaving it 20 minutes or so to cool to see if we could be looking at something heat related, I'll check the choke isn't partially stuck on before I start her again as it just occurred to me that it could tie in with the full throttle start, anyway I'll probably have to stick to my uber reliable Italian bikes going forward 😄, fingers crossed for the next start!.

PS an old fella just said "what a lovely bike, is it a Norton?", how wrong can you get!😄
Title: Re: Hopelessly unreliable these CB750's
Post by: mike the bike on August 04, 2017, 07:53:13 PM
Uber reliable Italian?  Wash you mouth with brake fluid!
Title: Re: Hopelessly unreliable these CB750's
Post by: Trigger on August 04, 2017, 08:03:23 PM
Brake fluid is too kind, try battery acid  ;D
I heard that bike start up at Crich and she sounded spot on, even after her journey to the TT.
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 04, 2017, 08:47:08 PM
Well she started first touch of the button, so god knows what happened in Ashbourne, good job because I'd got an audience by the time I left , I approached the bike willing it to start and it did so I like it again now 😄, I would as always be the first to vouch for the unflinching reliability of these fine machines!.

Trigger, what you didn't see at Crich was the bike almost cutting out about 2 minutes later, pilot error on that occasion I had forgotten to fully return the choke 😄
Title: Re: Hopelessly unreliable these CB750's
Post by: Trigger on August 04, 2017, 09:13:30 PM
If you ever get bored of her, I have a £500 note for her  ;D ;D
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 04, 2017, 09:19:34 PM
Way too generous Graham, can't be worth more than a tenner, I built it remember 😄
Title: Re: Hopelessly unreliable these CB750's
Post by: Trigger on August 04, 2017, 09:27:48 PM
Way too generous Graham, can't be worth more than a tenner, I built it remember 😄

SOLD, do you via paypal or cash on collection  ;)
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 04, 2017, 09:51:53 PM
Ha, I do sometimes wonder what it would sell for though , I've seen others sell between 2k and 30k, the 30k ones were perfect replicas with Magnesium sliders etc, the 2k ones were total rubbish with the CB750 side panels still fitted etc, so I guess it's somewhere between 2 and 30 grand 😄, (Closer to the 2 than the 30 of course, I'm not delusional)When I had the T250 every time I went out someone tried to buy it, with the Honda nobody does, lots of attention and compliments but no enquiries as to price, so either they think it would be too expensive or in reality they actually think it's crap and wouldn't want it 🙂, when its finished i.e. When it has the 4 into four exhaust/ CR paint job, alloy oil tank , cable rear brake etc etc I'll advertise it just to find out.
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on August 05, 2017, 10:31:32 AM
Mark if you do get rid of it buy the Half Faired Thruxton 1200R a proper full blown café racer & totally reliable.. ;D

regarding the ecup at Ashbourne if the fuel was getting a bit low could have been some shit getting through ? just a thought.. :o
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 05, 2017, 10:58:09 AM
I'm looking at an MV Augusta F4 1000S next week Greebo, been my dream bike since they came out, only 2 issues, no space to put it and struggling to justify another bike spend 😄, problems are there to be solved though aren't they!.

Fuel wasn't low but yes could have been a bit of contamination , keep meaning to fit an inline filter I've had in the garage for the last 18months!
Title: Re: Hopelessly unreliable these CB750's
Post by: SteveD CB500K0 on August 05, 2017, 06:23:41 PM
I had an F4 back when I had a barn. It was Eamon's bike actually.
It was unreliable, uncomfortable, excruciatingly uncomfortable, expensive to fix. Did I say that it was uncomfortable?

It was also bloody drop-dead gorgeous


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Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on August 05, 2017, 09:41:49 PM
I had an F4 back when I had a barn. It was Eamon's bike actually.
It was unreliable, uncomfortable, excruciatingly uncomfortable, expensive to fix. Did I say that it was uncomfortable?

It was also bloody drop-dead gorgeous

# I agree with the "Drop Dead Gorgeous" best looking bike around [I think]
I almost bought one 3 years ago, but what you said in your 2nd line above stopped me buying it, you need to be a contortionist to ride one for any distance & also have deep pockets [full of cash] 

I think the last thing Mark needs right now is another uncomfortable bike & an expensive unreliable one at that... ;) but if you do buy one Mark I hope you will enjoy it !


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Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 05, 2017, 11:00:52 PM
Well I hear you but...., my CBR1000f is so comfortable it's like a feather bed , my 900ss isn't, but it's brilliant fun to ride, so light and torquey, my CR isn't comfortable , isn't brilliant fun to ride really,or light or torquey, but it ticks the nostalgia box, my scrambler is great fun to ride, reasonably comfortable now I've modded it , light and flickable and a hoot on tight twisty lanes, so they all fill particular roles, have good and bad points etc, BUT none of them are as utterly drop dead gorgeous as the MV so I'd better get one 😄, not having one because it's uncomfortable i.e. committed riding position, cramped, is missing the point in as much as you don't buy one of these to be comfortable, you get an MV because it pulls at your heartstrings, is a missile, has pedigree, is exotic and is more beautiful and desirable than Emily Ratajkowski ! 👀, that said I might wait til next year if the one I'm viewing next week isn't spot on.
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on August 06, 2017, 10:24:19 AM
Emily Ratajkowski is that her that use to play in Coronation Street ?.. :o thought you had better taste Mark. stick with the MV... ;D
Title: Re: Hopelessly unreliable these CB750's
Post by: hairygit on August 06, 2017, 10:40:51 AM
Emily Ratajkowski is that her that use to play in Coronation Street ?.. :o thought you had better taste Mark. stick with the MV... ;D
She'd be more reliable, and probably "Go" better than anything shitalian!

Sent from my X6pro using Tapatalk

Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 06, 2017, 04:36:42 PM
Emily Ratajkowski is that her that use to play in Coronation Street ?.. :o thought you had better taste Mark. stick with the MV... ;D
She'd be more reliable, and probably "Go" better than anything shitalian!

Sent from my X6pro using Tapatalk

Thought I'd flush you out with the Italian bit HG 😄
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 06, 2017, 04:37:54 PM
Emily Ratajkowski is that her that use to play in Coronation Street ?.. :o thought you had better taste Mark. stick with the MV... ;D

Yes that's her G 👍
Title: Re: Hopelessly unreliable these CB750's
Post by: hairygit on August 06, 2017, 06:10:10 PM
Emily Ratajkowski is that her that use to play in Coronation Street ?.. :o thought you had better taste Mark. stick with the MV... ;D
She'd be more reliable, and probably "Go" better than anything shitalian!

Sent from my X6pro using Tapatalk

Thought I'd flush you out with the Italian bit HG 😄
Problem is, you lunatics are like trying to stop a toddler playing in a cat litter tray, you won't learn until you end up with it in your hands, and probably in your mouth too! Then whingeing about the taste!

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Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on August 06, 2017, 08:49:09 PM
Emily Ratajkowski is that her that use to play in Coronation Street ?.. :o thought you had better taste Mark. stick with the MV... ;D
She'd be more reliable, and probably "Go" better than anything shitalian!

Sent from my X6pro using Tapatalk

Thought I'd flush you out with the Italian bit HG 😄
Problem is, you lunatics are like trying to stop a toddler playing in a cat litter tray, you won't learn until you end up with it in your hands, and probably in your mouth too! Then whingeing about the taste!

Sent from my X6pro using Tapatalk

Emily Ratajkowski could end up with a similar sort of problem 👍
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 02, 2017, 06:07:09 PM
It's only gone and done it again !, bloody unreliable hondas 😄, starts fine from cold, runs fine at any revs, stop when it's well warmed up (10 miles this time) and it won't start, waited 10 mins and it started with a handful of throttle, then ran fine at any revs again, when I got home I meant to see if it would start hot again, but being a bit senile I forgot and put it away, any thoughts?.
Title: Re: Hopelessly unreliable these CB750's
Post by: hairygit on September 02, 2017, 06:17:21 PM
Just a thought here, are you using points or electronic ignition? I knew a guy with a 400/4 with electronic gave similar issues, only when hot, turned out the pick ups were being affected by the heat in the points cover, causing massively increased electrical resistance. That's why superconductors work best at the coldest they can.

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Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 02, 2017, 06:58:04 PM
Electronic, the original Piranha set up that came with the donor bike, it must be 20+ years old as the previous owner took it off the road in 1995, so you could be onto something there H, I believe that the Newtronic set up is pretty much the same as the old Piranha so maybe it's time to invest in a new one.
Title: Re: Hopelessly unreliable these CB750's
Post by: hairygit on September 02, 2017, 07:02:19 PM
If you have the stuff to try it with conventional points, give that a try before spending loads when it may not be the issue, or maybe there are shitalian components in the electronic system! (Couldn't resist that!)

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Title: Re: Hopelessly unreliable these CB750's
Post by: K2-K6 on September 02, 2017, 07:22:26 PM
Take a spare plug out with you and if it does it again you can check for a spark there and then on any of the cylinders to see if the ignition isn't working or it's something else.

My dad's friend always just put his finger in the plug caps to check for sparks years ago,  proper old mechanic's fingers he had.
Title: Re: Hopelessly unreliable these CB750's
Post by: flatfour on September 02, 2017, 07:50:51 PM
The Newtronic system fitted to my Benelli 750/6 would do exactly as you describe - run perfectly for many miles (sometimes as much as 2,000 miles went by between failures) and then stop producing sparks, only for it all to work normally again a while later.

It's the only bike that I've ever owned that went home on a trailer (twice).

The problem would, when it occurred manifest itself after a short spell of idling (i.e. at traffic lights). Things would then return to normal after everything cooled down.
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 02, 2017, 08:21:57 PM
If you have the stuff to try it with conventional points, give that a try before spending loads when it may not be the issue, or maybe there are shitalian components in the electronic system! (Couldn't resist that!)

Sent from my X6pro using Tapatalk

Ha, actually my 900ss has developed a minor issue, tickover a little high, you can bring it down to normal by quickly cracking the throttle open and shut, I suspect the previous owner may have fitted a Honda throttle cable 😐
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 02, 2017, 08:23:08 PM
Take a spare plug out with you and if it does it again you can check for a spark there and then on any of the cylinders to see if the ignition isn't working or it's something else.

My dad's friend always just put his finger in the plug caps to check for sparks years ago,  proper old mechanic's fingers he had.

Great tip, I'll do that.
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 02, 2017, 08:36:03 PM
Thanks all for the comments/advice I'll have a look at it next weekend, busy tomorrow it's Italian bike day at CMC clay cross, see you there H 👍
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 03, 2017, 10:15:01 AM
Electronic, the original Piranha set up that came with the donor bike, it must be 20+ years old as the previous owner took it off the road in 1995, so you could be onto something there H, I believe that the Newtronic set up is pretty much the same as the old Piranha so maybe it's time to invest in a new one.

Mines got the Dave Silvers one on Mark about £99.00..& simple to fit.

PS... did you get my private message  yesterday ?
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 03, 2017, 04:52:29 PM
Just read it G, bad news followed by good news!, I thought I saw you as I rode away from CMC but I guess it was another thruxton owner.
PS thanks for the DS tip, £99 is a bargain if I end up needing one.
PPS just check on DS website, they are now £110 but that's still cheap.
Title: Re: Hopelessly unreliable these CB750's
Post by: Seabeowner on September 03, 2017, 05:10:04 PM
DSS EI £132 including the VAT. I'm still running my 36yr old Piranha that was bought for a Guzzi.
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 04, 2017, 09:40:38 AM
Just read it G, bad news followed by good news!, I thought I saw you as I rode away from CMC but I guess it was another thruxton owner.
PS thanks for the DS tip, £99 is a bargain if I end up needing one.
PPS just check on DS website, they are now £110 but that's still cheap.

Hi Mark

No it wasn't me mate, still suffering unfortunately, I cant do with any bollock bashing right now...Ouch
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 04, 2017, 04:42:00 PM
Ha, I can imagine, nice line up, shame you've only got 3 though, I believe that 4 is the bare minimum that any biker should own, not more than 4 though because obviously that would just be greedy 😄
PS only one floor to your house as well, every man should have 2, I mean how do you go on when the wife misbehaves an needs throwing down the stairs?.
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 05, 2017, 10:49:53 AM
Mark

3 of the best is enough for me mate, I don't like fiddling with them too much & I am not as capable as you with the spanners.. ;) bikes are for riding & we all can only ride one at a time
I have to have them looking as near perfect as possible all the time. so it takes me hours to keep them clean which is sometimes too much for me at my age. :'(

Regarding the bungalow I did have 2, but with no stairs, just sold the 2nd [in Spain]
My other half is a little angel & she goes to work brings in the cash while I go out riding to Matlock etc, so no need for the violence.. ;D.. 25 good years together so far.

Lisa says hello >>>
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 05, 2017, 12:41:11 PM
Ha, and something tells me that if anyone was going to take an unplanned trip down the stairs (if you had any) it would have been you! 😄, Yes cleaning bikes is a pleasure that eventually becomes a pain, oh to be 21 again, nothing seemed to hurt back then!, anyway very attractive line up of photo's and if you don't mind me saying so that includes the good lady 👍
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 05, 2017, 01:04:33 PM
Mark, thanks for "some" kind words.. ;) but Are you trying to insinuate that Lisa would want to get rid of me.. :o Well if she did she has had 25 years to do so but not tried ....Yet... ;D... perhaps that's why she encourages me to get on my bike. :-\
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 05, 2017, 02:42:22 PM
Mark, thanks for "some" kind words.. ;) but Are you trying to insinuate that Lisa would want to get rid of me.. :o Well if she did she has had 25 years to do so but not tried ....Yet... ;D... perhaps that's why she encourages me to get on my bike. :-\

Ha, yes I always wonder if that could be the reason that my wife never has a problem with me going out on mine! 😄
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 05, 2017, 03:10:14 PM
Mark, thanks for "some" kind words.. ;) but Are you trying to insinuate that Lisa would want to get rid of me.. :o Well if she did she has had 25 years to do so but not tried ....Yet... ;D... perhaps that's why she encourages me to get on my bike. :-\

Ha, yes I always wonder if that could be the reason that my wife never has a problem with me going out on mine! 😄

These females can be very devious Creatures, especially that Emily from Coronation street who you fancy... ;D
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 12, 2017, 12:31:08 PM
I'm looking at an MV Augusta F4 1000S next week, been my dream bike since they came out, only 2 issues, no space to put it and struggling to justify another bike spend 😄, problems are there to be solved though aren't they!.


Mark I have found a cheap MV for you... 8)

http://www.ebay.co.uk/itm/MV-Agusta-F4-1000-Veltro-Strada-1-Of-Only-99-Ever-Manufactured-/152667488002?hash=item238bb0ff02:g:EnkAAOSw9IpXzpb3
Title: Re: Hopelessly unreliable these CB750's
Post by: MarkCR750 on September 12, 2017, 03:39:39 PM
Blimey a free one, now that is a bargain, unfortunately I don't like the black ones so I'll keep looking 😄👍
Oh hang on my phone hadn't loaded the ad properly, 53k, well I would have but as I say, blacks the wrong colour!.
Title: Re: Hopelessly unreliable these CB750's
Post by: Greebo on September 12, 2017, 08:00:06 PM
Mark you don't only need a new phone you should have gone to "specsavers"
 ;D... :o

its £55K not 53
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