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Motor cross bike

The bike is reving up and down and i just put a new inlet rubber on and it is still doing the same

Posted by ebo366 on

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Anonymous

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If it is a 2-stroke engine u might have a problem of a crank seal that is worn.take quickstart and spray it around the suspected  area while bie is running.ideling will increase dramatically if substance is sucked in at  the air leak.check for warn or loose needle situated underneath carb slider.dont b shy to ask!

Posted on Nov 02, 2007

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Hey Elijah... the main jet on these bikes is not "adjustable"...it is a set sized jet.. what you did is probably fixed the air leak that was causing the rev issue..

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The loss of power is usually due to the need for a valve job. Do a compression check. If compression is lower than 120 psi a valve job is called for. While you have the head off, install new rings. Considering the age of the bike, a new cam chain would not be a bad idea as well. Another possibility is a lean fuel/air mixture; If the bike has an idle speed that you can not get to slow down then there is an air leak letting un-carbureted air into the mix. Cracked rubber seals or bad gasket on the intake manifold would be the likely source. tombones49_50.gif

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www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

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1 Answer

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Lean mixtures burn very slowly, at times slowly enough to continue burning through the power and exhaust stroke, causing a backfire when the intake valve opens, and that flame gets a shot at the new mixture charge.

In normal operation, as the engine slows, the fuel delivery from the main circuit falls off, and the idle circuit is supposed to take over. If the idle circuit flows insufficiently, that becomes a transition to fuel starvation.

You can try pointing an unlit propane torch into the inlet air, and see if you can get closer to an idle while supplying a supplementary fuel source. You will need to do this in a way that gets propane to both carburetor inlets, maybe rigging a Y with vacuum hoses and electrical tape...

This started with work on the carburetors, so the fuel system would be the most suspect. That, and the fact that it will run at higher RPM would seem to rule out fuel delivery.

I was looking around at photos while developing this answer (needed to know whether this was a twin or a 4-cylinder), and one resource said the idle speed should be 1,200. I don't know if that's right, but maybe 1,000 RPM is too slow for this motor to keep it together. (I do doubt that, though.)

When I wrote that last sentence, I started to second guess myself, thinking "What if the fuel shutoff(s) is/are vacuum operated, and as the bike approaches idle there is insufficient vacuum to hold it/them open?" But the I rejected that, because there is even less vacuum at cranking speeds, yet the bike starts.

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1 Answer

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