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Post by jamieallen3166 on May 20, 2012 18:43:47 GMT
I am having some issues in relation to my p200. I have recently seized it so replaced the barrell and piston (parmalit 225) I have upjetted the carb to suit.
I have a standard exhaust, but will be replacing with a PM pipe shortly and a Dellorto PHBH 28mm carb.
Since doing this I have had an annoying small rattle around 40mph.
The only thing i can think of is the small end bearing on its way out, but not too sure if this would cause a seizure of any kind.
The piston and rings were fine when I checked recently........
Just cannot think of anything else, other than possibly the timing.
I need to add to add that at the moment, the scoot takes around 30 - 40 kicks to get it started and you need to fully throttle with no choke, this in itself is a bit strange too.
Any sensible thoughts would be much appreciated and if you live near emsworth, come pay a visit!
Look forward to hearing from someone soon.
Jamie
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Post by kru251 on May 20, 2012 22:21:37 GMT
Is that really 30 -40 kicks and not 3 or 4? Definitely something not right here then. Compression good is it?
Idle jet in carb not blocked or something as simple?
Rattle: Are you sure it's internal to the engine? I have just had to re-rivet a Lambretta sports exhaust with a tinny rattle that showed about 30mph and was a loose baffle but it just sounded 'engine based' until investigated.
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Post by Devo McDuff on May 20, 2012 23:03:49 GMT
Blimey, you must have calves like Stuart Pearce.
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Post by sbwnik on May 21, 2012 17:21:04 GMT
Rattling noise at about 40?
Pinking... check your piston for damage, it sounds like it may be running lean. If so, upjet again. What's your timing set at? It'll need changing (I can never remember which way without sitting down and working it out..) for that kit.
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Post by jamieallen3166 on May 21, 2012 17:30:12 GMT
Guys, thanks for the advice. After some discussion with Gary at Allstyles, it may be because the head has not been profiled sufficiently and my stupidity in not renewing the small end bearing! He has a story about that ! Jamie
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Post by sbwnik on May 22, 2012 8:34:48 GMT
LOL, yes it could well be a knackered small end bearing. I can see what he's saying about profiling - I think running too much compression would have the same pinking effect?
Thanks for the update on that.
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Post by pxguru on May 23, 2012 10:56:23 GMT
30 to 40 kicks flat out no choke really ain't right. If your compression is acceptable and you are sure there are no big air leaks (base gasket, carb to box etc. ) Check your gear oil level before starting from cold. If a little petrol pours out the clutch side oil seal has gone. If a lot of petrol gushes out carb float needle is leaking (even if it looks perfect).
I think your timing should be fine on the standard A mark (23 degrees) or a bit closer to the IT mark if you're a worrier.
Main jet on a 24/24 I would guess at 125 or bigger.
Where were the sieze marks on the piston? Did you take a picture?
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bsr65
High Number
Posts: 114
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Post by bsr65 on May 23, 2012 14:18:04 GMT
if the carb float needle was leaking would that allow fuel into the gear box past a good oilseal? the reason i ask is that ive been asked to look at a mates scoot that is loosing fuel with no obvious leak.
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Post by sbwnik on May 23, 2012 18:42:45 GMT
No, that would be a dodgy seal.
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Post by pxguru on May 24, 2012 2:30:26 GMT
In my experience if the crankcase is full of petrol the clutch side oil seal won't hold it overnight even if the seal is in good enough condition to run ok. You will have some run marks of fuel leaking out of the seal on the flywheel side too (if you park overnight on the centre stand) but most will leak into the gearbox
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Post by sbwnik on May 24, 2012 12:32:28 GMT
Really? You must have run some shagged engines.
I've never had a problem with that, and I never turn my fuel off, and never have. Do you bond your seals?
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Post by pxguru on May 25, 2012 11:57:40 GMT
I have only seen happen this twice in my 29 years of shagging up Vespas! I still never turn the fuel off either  The only seals that dont leak at all are new ones. Once jamieallen3166 puts the PHBH on it will all be fine. If it's an autolube, the leak will be washing all the oil off and it will be starting raw from cold (eeewww!). |
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Post by sbwnik on May 26, 2012 22:34:44 GMT
Always let them tick over for a little before going off, although modern oils have better 'cling' factors than old fashioned ones by all accounts. If the bike's run pretty much every day then the oil should survive, the top end drying out should only be an issue if it's left for any time.
Or if you're using crap oil, naturally...
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The only seals that dont leak at all are new ones.