High_Fiver, on Jun 15 2010, 05:10 AM, said:
Bike sounding a bit rough and spluttery when idling fine when i open the throttle
any ideas of what could be causing it ??
also seems to be running a bit hotter than normal (or maybe it's just the hot weather makes it feel like that)
all fluid levels fine using 80:1 mix and never been a problem before
thanks in advance
Ali
After adjusting the mixture screw, if it's still rough I'd look into:
water in fuel or stale fuel. We often store the bikes with a partial full fuel tank which presents two problems,
a larger surface area of fuel to allow "boiling off" or evaporation of the high-end aromatics that aid starting
and low-speed running and, a volume of air that presents condensation of water. This can be cumulative and
the results build on themselves to eventually cause symptoms. I like to store my bike in between rides
with a full tank.
Possible air leak. Usually this involves the manifold/reedcage area and most often is caused by over tightening
the manifold (the capscrews only go to about 7-8 ft lbs max) which causes the manifold to bow in between the
bolt holes.
a still obstructed pilot jet. At .35/.38mm, the pilot jet is extremely small and a piece of grit can easily lodge in
it. Most of us use fuel cans for years and dirt can accumulate in the bottom of the container so it's a good idea
to add an inline fuel filter. When using compressed air to clean jets or passageways in carbs, always force the
air in the opposite direction that the air of fuel flows as the orifices are usually funnel-shaped and this will prevent
the particle from staying lodged at the bottom of the "funnel".
Jon
Help
High_Fiver 
