P200E Oil Leak - or hidden problem

[xbrito101]

Following a re-vamp of my PX200E, I managed to trace an oil leak to be coming from in between the threads of the exhaust flange and the barrel.  As the engine was out at the time, I was able to fully unscrew the flange, clean it and the barrel up and fully tighten the  flange back in place.  Now after riding over the summer, the old leak has reappeared same place, even though the flange is still screwed in tight. My initial thoughts is to re-open the flange, spread a load of exhaust paste over the threads and re-tighten.  

But - before I do I just want to make sure that it may not be some other internal issue that needs to be fixed?  The oil looks more like gear box oil rather than a mix of two stroke and petrol.


Engine is a bog standard PX200E with auto lube.

Any suggestions?


Thanks in advance

[henri]

i cant see how gear oil could be getting up there unless ya clutch side seal was blown ,an that would be giving you other issues an symptoms ,more likely its half burnt 2 stroke oil weeping out , i'd do as ya plan to re-seal it but use something else than exhaust assembly paste , probably a silicon/copper gasket goo ,loctite do 1 thats for high temp areas n turbo's an exhaust flanges ,its also good for blowing head gaskets n suchlike ,
its "loctite 270" or theres "ultra copper" by permatex , both get recomendations for use on smallframe head gaskets on tuned scoots an will be up to the job .an wont give you the same amount of grief as exhaust paste if ya ever need to remove the stub again . H

[xbrito101]

Cheers Henri - will follow your advice

[rab]

It could be leeking from the carb base gasket and finding its way down the front making it apear to be from somwere else . i had a leek not that long ago it was picking up the black soot on its way making it look like dirty engine oil .it took me weeks to find the cause.i no longer use the auto lube just re check its not weeping from the head aswell

[henri]

as rab says n i shud of asked earlier ,are ya sure the leaks on the stub ,as if its actually at the join lower down it could be blown back up an just be settling there , an coz ya had a leak there before youve jumped to a conclusion its back , oil leaks are beggars to trace sumtimes , an ive been led a few merry dances n circles myself in the past , on my hack ive given up an just top the beggar up regular, you can always tell where ive parked ,H

[sbwnik]

I'd go with Henri, I've had similar and traced it to the breather blowing oil out, then air movement from the fan sucking it forward and depositing it on the cylinder... That's on a P2 BTW. I solved it by putting a 6mm cable adjuster in the place of the breather (think it was 6mm.. Henri..What's the thread for it? ) and putting a 6" length of fuel line over the end of that. It also had the benefit of stopping the back pressure forcing oil out when I killed the engine and stuck it on the prop stand!

[henri]

erm , god you put me on the spot, erm , erm ,etc , i think (only think coz ive had 1 or 2) but the breathers on a m6 thread , an a adjuster sounds right , many moons ago i set a mates p with a remote breather , bout 6 quid on e bay n they look like mini k&n type air filters clamped on the pipe from adjuster, rackin me brain the answers comin up " dunno" ,
jesus its cold out,ive nipples like "chapel hat pegs/organ stops" ,been to shed n back an it is a 6mm hole,m6 thread , well as far as my drunken shakin hand can tell,,cheers nik ,nxt 1's on you , H

[sbwnik]

Thanks, I should just have said 'clutch adjuster' really

[al]

I had the same prob on my p200.I was worried for a while but just turned out to be the exhaust flange had come loose.It had started as I ran it in after been stood for years.I used fire putty on it and has been fine since.

[doulsy]

funny how when you google vespa problems you all ways end up back on here  when i done my first 100 mile on my p200 in january after a rebuild i noticed a leak on the outside at my stubb and exhaust clamp, wasn't much so i never gave it a thought, the other week i put a sito + on it and have noticed the leak is now on the inside, it looks worse than last time, i have only let the scoot tick over since i changed my exhaust, it wasn't a a great fit tbh but i remember being worried about snapping the exhaust clamp, should i try some sort of paste on this? or just give clamp bolt another few turns? is there torque settings for clamp bolt?

[henri]

buggery tight . H

[xcbrito]

Apologies for not getting back sooner - it was the flange that was leaking - since applying some sealant and tightening - all appears well

[doulsy]

I removed my sito plus exhaust tonight, i put it on my scooter just after i did my first 100 mile with built up engine, since then it has only been sitting idling with the odd rev, i removed it to see if i can make the clamp a bit better, however when i removed it it was full of fuel, maybe 1.5 litre?

[ianmartin40]

exhaust full of petrol is often carb float needle not shutting off fuel and carb, trickling fuel into engine all the time engine off, or float heights not correct, you can test float needle by holding carb and blowing into fuel inlet to carb, and while blowing push float up and it should shut off, sometimes floats are at wrong height or are no longer floating due to a hole in them.

[doulsy]

Mar 2, 2016 21:41:26 GMT ianmartin40 said:

exhaust full of petrol is often carb float needle not shutting off fuel and carb, trickling fuel into engine all the time engine off, or float heights not correct, you can test float needle by holding carb and blowing into fuel inlet to carb, and while blowing push float up and it should shut off, sometimes floats are at wrong height or are no longer floating due to a hole in them.

allready replaced a few parts of the carb, really should have bought a new one when bits started breaking in my hand.

[pxguru]

Filling up the exhaust is nothing but the float or needle. No need to test it just get a new one Or buy a whole Cosa float top with the bigger hole.

[doulsy]

i had ordered a new one, remove my spark plug and carb and kicked engine till all the fuel came out crankcase, drained my gearbox oil to check for any smell of petrol, it was fine so im ready to build back up once the parts are here, another lesson learned in vespa world