Author Topic: OUT AND ABOUT 2018  (Read 27965 times)

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: OUT AND ABOUT 2018
« Reply #210 on: July 05, 2018, 09:59:10 PM »
One bike there was stunning. It was built from boxes of bits by a chap we know who lives in our village. It's a Moto Guzzi, 1946 I think, other than that I know nothing about it at all. An absolute peach though. Edit, just worked out it is a 1949 Airone Sport 250cc. [ Guests cannot view attachments ] [ Guests cannot view attachments ]
« Last Edit: July 05, 2018, 10:39:36 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Laverda Dave

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Re: OUT AND ABOUT 2018
« Reply #211 on: July 10, 2018, 09:50:23 AM »
We went for a ride to Marlow in Bucks on Saturday. I took the Morini the O/H took the rebuilt CB250RSA to clock up the final 50 miles before it's 500 mile service.
Traffic was awful on the A40 due to the world cup so we came back on the M40 for the last 10 miles but keeping speed down to 55. The 250 siezed solid! 2 hour wait for recovery.
I begun to strip the engine down yesterday, not a pretty site. Holed and melted piston, scored barrel, scored cam and bits of piston under the valves.
Not sure what to do now, if I buy another engine I won't know its history and most engines for sale are out of the bike so buying blind. I can get the cam reprofiled and maybe try and salvage the valves or buy new and get the seats cut if damaged? I'm not sure about the crank until I get to it but likely to need new mains, maybe I'll try SEP to rebuild it, anyone used SEP?
It's a shame as the O/H loves riding the bike now she has passed her test but it looks like that's it for the Summer for her :(
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Online K2-K6

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Re: OUT AND ABOUT 2018
« Reply #212 on: July 10, 2018, 10:25:34 AM »
Wow, what a shame after all your hard work in rebuilding it.

Do you have a close picture of the spark plug tip? And which grade of plug is it? Hope you don't mind me asking.

Nigel.

Offline Laverda Dave

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Re: OUT AND ABOUT 2018
« Reply #213 on: July 10, 2018, 11:48:51 AM »
Hi Miguel, I'll dig it out when I get home, just going into London to watch the flypast. It was new and the correct plug.
The piston has done some damage to the barrel as in its scored. When I drained the oil there was about 1/2 litre but it was on the mark 200 miles ago. No leaks and no sign of burning oil either (I rode behind the O/H to check). I noticed the air box was covered in an oil mist when I stripped it and assume this was blow by as the piston melted!
I would like to rebuild this engine (again) depending on cost. Do you have any recommendations for who can rebuild the crankshaft?
Dave
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: OUT AND ABOUT 2018
« Reply #214 on: July 10, 2018, 11:55:59 AM »
What a shame. Give Barry at T & L Engineering in Bedford a call for Crank work.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Laverda Dave

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Re: OUT AND ABOUT 2018
« Reply #215 on: July 10, 2018, 04:09:39 PM »
Here you Nigel. The plug is a NGK DR8ES as detailed within the Haynes Manual and bought new.
Just going back into the garage to finish the strip down and initial assessment of the damage. Looking at the bits of piston in the sump it appears as though the gearbox has mashed a lot of the shrapnel into powder!
Thanks for the tip Julie. I may require his services!
At least the flypast took my mind off the carnage  :-\
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline sye

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Re: OUT AND ABOUT 2018
« Reply #216 on: July 10, 2018, 04:48:21 PM »
The holed piston may be as a result of too lean a mixture or detonation (pre ignition). Check plug colour, timing and mixture are correct when rebuilt.

Offline Laverda Dave

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Re: OUT AND ABOUT 2018
« Reply #217 on: July 10, 2018, 10:36:16 PM »
Sorry, I forgot to add the photo of the plug. Here goes.
The crankshaft small end bearing is beyond repair so it's refurb crankshaft if possible. Thanks for the tip Julie. I will add any progress details to my previous rebuild thread and not hijack this one!
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline Trigger

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Re: OUT AND ABOUT 2018
« Reply #218 on: July 10, 2018, 10:43:47 PM »
Can i see a pic of the other piston. What is a little strange is, the holed piston is very clean of any carbon deposits.

Online Bryanj

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Re: OUT AND ABOUT 2018
« Reply #219 on: July 10, 2018, 11:02:03 PM »
That plug looks very light gray (weak) to me

Offline Johnwebley

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Re: OUT AND ABOUT 2018
« Reply #220 on: July 11, 2018, 07:41:19 PM »
Out in Forest of Dean. Great burgers n beer.gave the Ed a run tonight

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Offline Johnwebley

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Re: OUT AND ABOUT 2018
« Reply #221 on: July 11, 2018, 09:36:07 PM »
Out in Forest of Dean. Great burgers n beer.gave the Ed a run tonight

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Should be RD
DAMN predicted text

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Offline Laverda Dave

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Re: OUT AND ABOUT 2018
« Reply #222 on: July 12, 2018, 05:34:37 PM »
Yes, that's the same one Oddjob. I've enquired about the one in the breakers, is the cam OK etc and the reply I got was to come and see it! Like I'm going to travel 130miles to see a potential heap of junk, no customer service at all (angry thread >:(). The other engine has broken fins and missing bolts etc, so not worth it. I have stripped my engine down and it's not looking like it should go in a skip. Needs a crank rebuild as small end is toast (scored).
Ideally I'd like an electric start motor but these are very hard to come by and not very reliable from what I've heard. The dilemma is the O/H really struggles with the kick-start even though it has a decompresser. Looks like I'll rebuild this and sell it straight away to fund a newer CB250 such as a nighthawk or something. I'll add any updates to my original cb250rs rebuild thread.
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline Trigger

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Re: OUT AND ABOUT 2018
« Reply #223 on: July 12, 2018, 11:37:10 PM »
I don't mind a trip to Spalding for a member, only 45 mins away. Always a gamble with any secondhand motor, you can't see inside the bloody things.

Offline Johnwebley

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Re: OUT AND ABOUT 2018
« Reply #224 on: July 13, 2018, 09:27:51 AM »
Agree.have you got one of those mini inspection cameras?
I don't mind a trip to Spalding for a member, only 45 mins away. Always a gamble with any secondhand motor, you can't see inside the bloody things.

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