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Open Mouth Carb Question

Posted: Fri Nov 23, 2012 3:46 pm
by servetakid
Just got a quick question, got my engine out to sort some minor problems. I have noticed the flywheel is caked in oil as is the cowling, is that that the fly wheel side seal may have gone or that the carbs sp[it back is being sucked into the flywheel? Just wondered if those running an open mouth carb on the flywheel side have noticed there is caked in oil?

Cheers,

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 3:49 pm
by GP240
most likely carb spit, could also be exhaust manifold gasket leaking.

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 3:59 pm
by diesel
Yep, the spitback covers my flywheel cowl, inside the sidepanel the runner and anything rearward of the carb including the hub ,It doesn't take long for it to happen either.My cheap chrome flywheel cowl looks like new when I wipe the crud off though and I suspect it would have rusted away to nothing by now if I ran a filter

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 4:53 pm
by servetakid
Good to know, my headcowling is knackered so took it off and found the exhaust to spitting abit... It needs this winter tear down me thinks!

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 4:54 pm
by servetakid
So i think its the cobinations of both carb spit back and exhaust leakage.

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 5:21 pm
by GP240
well yes and no, here's another two to add to the works,

cylinder-head and base gasket leaking.

be best too do a top-end overall, at least it will be clean and tidy afterwards haha, but also eliminates them to be leaking.

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 5:35 pm
by servetakid
Ive just had top end, wanted to see how it was getting on in there. Think there may have been some slight blowing, but nothing much. But the piston has some makrs on it...

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 6:03 pm
by Andy Pickering
I spent 4 lovely hours last sat Jordan degreasing spit back and road dirt from flywheel side off engine and yes I run an open mouth delly..

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Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 6:05 pm
by servetakid
Aye it is caked, just wanted to make sure as a sanity check!

Re: Open Mouth Carb Question

Posted: Fri Nov 23, 2012 6:06 pm
by servetakid
Aye it is caked, just wanted to make sure as a sanity check!