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Post by peteyparado on Mar 26, 2012 3:08:12 GMT -5
50mm bbk with hoca big valve performance head.a9cam, 20mm carb, had 95 jet than 88 still running rich.. anyone ever use small jet with a 50mm bbk? could it b timing? piston is on tdc,cam is lined up? what could it b any thoughts on advancing the cam one tooth,or should i just drop a jet??
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Post by 90GTVert on Mar 26, 2012 10:22:23 GMT -5
If your only symptom is that it's rich, I'd try a smaller jet first and it wouldn't hurt to make sure the float isn't set high while you're in there. If you're at a high elevation or use the stock airbox you 'll use a smaller jet than what you see a lot of people recommend.
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Post by Deleted on Mar 26, 2012 11:15:45 GMT -5
50mm bbk with hoca big valve performance head.a9cam, 20mm carb, had 95 jet than 88 still running rich.. anyone ever use small jet with a 50mm bbk? could it b timing? piston is on tdc,cam is lined up? what could it b any thoughts on advancing the cam one tooth,or should i just drop a jet?? there is no way its rich with an 88. you have a different problem. 20mm carb? so you took the 23mm off? |
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Post by Deleted on Mar 26, 2012 14:19:35 GMT -5
also what does a compression test say?
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Post by felliott on Mar 26, 2012 17:22:47 GMT -5
If you have a vacuum fuel shut off, it may be leaking fuel in the vacuum hose causing a rich mixture.
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Post by peteyparado on Mar 27, 2012 2:03:25 GMT -5
when you pull off the fuel line from the carb inline,should the fuel still coming out an keep dripping or will it drip some then stop! the scoot has a fuel petcock under the tank.. i herd a guy tell me the fuel only comes outs the fuel line when a vacuum is applied.. help please
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Post by Deleted on Mar 27, 2012 7:54:35 GMT -5
the petcock is a switch. when the engine sucks it open via the vacuum line it opens and gas flows. when the engine is off gas flow stops. when you take the gas line off the carb and gas flows for a longgg time its broke.
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Post by Fox on Mar 27, 2012 13:06:36 GMT -5
The petcock is actually a valve. A vacuum actuated valve. Vacuum is applied to a spring loaded rubber diaphragm inside that opens the valve to allow fuel to flow to the carb. The spring closes the valve when vacuum is absent. They sometimes go bad. Either they get gummed up from sitting un-used for extended periods or they get sediment/tank rust/grit in them that makes them stick open or the diaphragm itself can fail. You'll see them listed as a "fuel pump" on many parts sites. That is incorrect. They do not pump the fuel. The fuel simply runs downhill due to gravity. There are two types of these valves. One mounts to the tank bottom and has a strainer that protrudes up inside the tank to filter out sediment/debris. The other is frame mounted and is fed through fuel line. On the frame mounted ones it's best to install an in-line fuel filter between the tank and the valve because there is no strainer in the tank with a frame mounted setup. Tank mounted unit:  Frame mounted:  |
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