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Messages - p@ul

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1
CB750 / Re: Cylinder head exhaust stubs removal ?
« on: January 06, 2013, 10:18:17 PM »
Well..... I got the engine out today thanks to all the tips and advise. Got the studs out and breather cover off. However the sump cover wouldn't budge, I tried a little gentle persuasion with a screw driver but it wasn't moving...... Any tips ?
Also the removal of the top rear engine mount bar revealed a broken lug on the engine casing..... Not a major issue but could this be fixed I wonder ?

Cheers Paul

2
CB750 / Re: Cylinder head exhaust stubs removal ?
« on: January 04, 2013, 07:15:33 PM »
Thanks to everyone for the input.... I feel a little more confident now ;D

3
CB750 / Re: Cylinder head exhaust stubs removal ?
« on: January 04, 2013, 07:09:27 PM »
Hi Pete, now I understand...... I have stated in previous threads that I am a little inept at this sort of thing  :)
The motor is now sitting loose in the frame but I guess I could re install the 2 front left side mounting bolts and maybe 1 bar before I have a go at those pesky studs..... Thanks a lot for the sound advise. I will tackle the engine removal this week end, and yes I am right down to bare bones main frame and engine now so nearly there  ;)

4
CB750 / Re: Cylinder head exhaust stubs removal ?
« on: January 04, 2013, 01:39:17 PM »
Ah right so you're telling me i don't need to remove the studs to remove the engine on my F2 then, that's good but its going to be mighty tight to pull the engine out then. I tried doing it on my own last night but just ended up giving up...... I'll get my son  to give me a hand i think.

Cheers Paul.

5
CB750 / Re: Cylinder head exhaust stubs removal ?
« on: January 03, 2013, 10:47:37 PM »
Hi Pete, my F2 is the US version of yours if that helps.

Cheers Paul.

6
CB750 / Cylinder head exhaust stubs removal ?
« on: January 03, 2013, 09:56:43 PM »
I'm ready to remove the engine form the frame of my F2 but need to remove the stubs from the cylinder head. i have a Haynes work shop manual that covers all sohc 750's that states " the stubs are retained by 2 cross head screws " with no mention of a mod to the F2. I cannot see any screws retaining the stubs and i'm at a loss how i can remove them without causing damage to the stubs or cylinder head. They look quite corroded so maybe stubborn to shift at best !!
What's my best course of action  ?

Thanks Paul.

7
CB750 / Frame coatings
« on: November 29, 2012, 09:07:46 PM »
Good evening all,

My F2 is well on the way to being stripped now ready to have the frame and other bits and pieces coated ready for the Cafe build.
There is a coating firm in my Town who do the following coatings.... Polythene, nylon and PPA.  http://www.kelcoat.co.uk/
No mention of powder coating as you guys seem to favour. Is what they have to offer a form of powder coating ?
Any suggestions are very welcome.

Thanks Paul.

8
CB750 / UK Cafe Racer Market
« on: November 25, 2012, 12:51:59 PM »
Am i wrong or hasn't the Cafe Racer aftermarket parts business taken off in the UK yet ?. I'm looking for CB750 specific Cafe bits but i keep drawing a blank, even on eBay, yet its all happening in the US. I don't mind buying from the US but their postage costs are horrendous !!

Any thoughts ?

9
CB750 / Re: Electronic ignition
« on: November 24, 2012, 09:47:16 AM »
That's the info I was looking for...... Ta fella  :)

10
CB750 / Re: Electronic ignition
« on: November 23, 2012, 07:53:39 PM »
If you want to look at the Dyna S system, go to www.z1enterprises.com

They're a good price and the exchange rate is good too.

Jeff Saunders (the proprietor) is a member on sohc4.net and is a very knowledable and helpful chap.

Hi Steve, that set up.might just be worth a punt but I just need to check the state of the accelerator pump before i proceed.... Thanks for the advise.

11
CB750 / Re: Electronic ignition
« on: November 21, 2012, 08:24:07 PM »
Thanks fella...... I've started the strip down now so when i do pull the engine out i'll be able to inspect it more closely and maybe replace parts that are suspect. That is a long way off yet though. In the mean time at least i know it starts and runs  ;)
Thank you all for your valued input.

There will be many more questions that pop up over time i'm sure, some will be silly due to my mechanical ineptitude  ;D

12
CB750 / Re: Electronic ignition
« on: November 21, 2012, 01:40:02 PM »
Sounds like youv'e got a small improvement.

As an overview of this particular era it's probably fair to say that this is the start of running bike engines leaner to make them less poluting (particularly in USA) so where as previous models displayed more tolerance to precise jetting, ther is less room for margin on this model.

If it misses as you start to open the throttle it could be related to the accelerator pump (this sprays additional fuel into the carbs ONLY AS YOU TURN the twist grip) this is to overcome the weak running of the normal setup. It's a transition stage to make it accelerate cleanly without stuttering and if not working correctly would show as a slow or missfire response if not delivering enough fuel during that increased damand.


Exactly that... The misfire is as i twist the throttle and clears after about 3000 rpm when all rattles and misfires disappear and the motor sounds sweat.... BTW the bike is a US model !!

You may just be onto something here K2, thank you. I've just got to find where the hell this accelerator pump in located now  :D

13
CB750 / Re: Honda CB750 F1 cafe racer seat ?
« on: November 20, 2012, 01:45:45 PM »
I wait with bated breath for these pics as i am also looking at cafe seats for my f2 but not sure which one and method of fitting.

14
CB750 / Re: Electronic ignition
« on: November 20, 2012, 01:42:39 PM »
Thanks for the replies fella's... Some useful stuff to work on there. I was in the garage last night scratching my head at what to to first ( mechanically inept ) so i took the air box out, cleaned the plugs and inspected the points which all looked fine with out gapping them.  I started her up and while it took a short while to kick in, not half as bad as before, it seemed to hold a fast idle on choke a lot better. Am i right to suspect the idle/primary jets need looking at ?. It still misfired when i closed the choke though but i guess i didn't leave it long enough to get really warm before closing it i guess.

15
CB750 / Electronic ignition
« on: November 15, 2012, 08:02:33 PM »
I have a 750/4 sohc f2 that is a pig to start and warm up. Before i start taking it apart as a Cafe Racer project i want it running properly and i'm thinking seriously about replacing the the points with Electronic Ignition. Does any one here have any experience of fitting and tuning one of these and how much better the engine runs once fitted ?

Cheers Paul.

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