Rebuild and Smoking

[xbrito]

Over the last few months I have carried out a revamp of my PX200E as it was looking rather shoddy, although started and ran reasonably Ok. As far as the engine goes, I have de-coked the barrel, head and piston and replaced with new rings and gasket.  I removed and stripped the carb, replacing all gaskets including the gasket on the oil-flow.  As the scooter was sitting for over a year, apart from just running the engine a few times, I drained all the petrol out and filled with new.    I also replaced the standard exhaust with a sports model purchased from SIP.

Now that all is back in the scooter, the scoot will only run with the choke out, and stalls when pushed in. There is also an excessive amount of smoke, which I first put down to the oils used when rebuilding the barrel.  

I have read some forums which suggest the following:

a) Air leak between carb housing and engine case
b) oil seal behind flywheel
c) incorrect carb settings

I'm pretty sure 'a' is not the cause, also 'c' as I did not remove, nor remove or turn either the idle or mixture screws on the carb.  The oil seal I am not so sure. the only thing I can think of is that I had the engine sitting in an engine stand, with the barrel facing up, for two to three weeks while waiting for part, work commitments and available time while I carried out the de-coke.  Could it be possible that during this time, the seal dried out and cracked and is now causing the problem. Or could disturbing the oil flow within the carb be the issue.


Any other advice help would be appreciated. 

Thanks


 

[rab]

A shot in the dark but have you made sure you tightend the carb down properly not enough and it will leek too mutch and it warps an idea I got from kru I think it was is to put 2 gaskets on the carb base then if it has warp in it that should cure any leek . What colour is the smoke if it has a blue tint to it then the rings are letting oil past from below did you measure the bore before buying new rings ?

[henri]

a engine sat for a year can knacker the seals,they much prefer occasional/steady use.for the flywheel side you can swap a seal without splitting the cases ,an standard seals are about 6-7 quid so might be worth swapping it just to eliminate it as a cause.normally px's dont like/need a lot of choke but as it wont run without your mixture must be well lean.a air leak is the most likely culprit,as barrel's just been off/on i'd suspect the base gasket's seal.a year isnt really long enuff for seals to die,unless the engine was stored badly,but sounds like youve kept it ok.
if youve pre-mixed your first tank of fuel whilst auto-lube bleeds up that will give you bluish smoke an choke out =very rich mixture will give white smoke . h

[partanen]

Usually "white smoke" is actually steam. Too rich mixture gives black smoke.

[pxguru]

Gearbox oil smokes white too

Check the oil level in the gearbox. If its low fill the gearbox and start the engine again. If you start it and it smokes white and the gearbox level drops is the clutch side oil seal

[partanen]

Apr 27, 2014 20:20:25 GMT pxguru said:

Gearbox oil smokes white too

Or blue?

[pxguru]

You know when its gearbox oil, there is just too much smoke and more than you remember seeing before!

[sbwnik]

Have you upjetted for the SIP pipe? They recommend going up a size (two points)