james
2nd Class Ticket
Posts: 15
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Post by james on Oct 12, 2007 8:43:38 GMT
Just fitted a new JL style exhaust to my otherwise standard PX 125. I've changed the main jet to 100.
It starts fine, smoked a bit (white) at first and seems to run fine. I have noticed air blowing from where the exhaust fits onto the engine. I know the bolt is nice and tight on the clamp but I didn't use any gasket seal of any description. Should some air escape from this area? I notice there are some holes/vents here on the engine. I can't tell if the air is coming from these or the pipe.
Thanks.
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Post by Spence on Oct 12, 2007 11:23:51 GMT
Are you sure it's not just air blowing down from your flywheel? If the engine manifold's securely fitted there shouldn't be any gas escaping from the exhaust there.
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Post by bryno on Oct 12, 2007 12:04:42 GMT
as Spence says you will feel air from the flywheel there..
if it's smokey on start up have a look then should be able to see it, best be sure it is not leaking, messes up your mixture..
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bogey
2nd Class Ticket
Posts: 40
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Post by bogey on Oct 12, 2007 22:10:56 GMT
You could always seal the joint from the barrel to the manifold. Use bathroom silicone and put it on the barrel and then fit the manifold.
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james
2nd Class Ticket
Posts: 15
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Post by james on Oct 13, 2007 8:44:50 GMT
I don't there is an air leak now as when I open the choke when it is running it does not accelerate.
When I started it today tt was ticking over very slow, almost struggling to idle when warmed up.
When I took it out for a run it took a while before it would rev fully and the speed was SLOOOOOW. It got a bit better but struggled up hills and I had to keep changing down.
Also it started from cold first time with no choke and after the run I did a plug chop and it was black - sooty. When I tried to start it from hot is was more difficult to start.
I will open the air screw a little and change the jet for a 98. Any other ideas/causes please?
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Post by colonial boy on Oct 21, 2007 9:01:15 GMT
Hi there, interesting that my JL pipe has the same problem. The exhaust manifold doesnt have a clamp the way a standard exhaust does to tighten down on the exhaust outlet of the barrel.
I have tried using high temperature gasket materials etc as suggested above and I still have a small area of blow out. I'd like to suggest something useful but I am starting to think the JL manifold is just not designed well?!
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