Posted by little man upon the stair on November 5, 2009, 8:17 am
> Misfire between 4000 - 5000 rpm
Well, when it misfires at 4000 ~ 5000 RPM, are you twisting the
throttle a lot, or just a little bit?
Your motorcycle has rubber diaphragms that lift a vacuum slide which
controls how far the jet needle is pulled up out of the jet needle.
The vacuum slide won't be lifted unless the engine is producing enough
vacuum
to use the fuel that comes through the needle jet.
This is to reduce hydrocarbon air pollution from unburned fuel.
Another possibility besides dirty carbs is that one of your vacuum
slides might have a small hole in the rubber diaphragm.
Posted by TOG@Toil on November 5, 2009, 10:15 am
> Another possibility besides dirty carbs is that one of your vacuum
> slides might have a small hole in the rubber diaphragm.
Wrong again. When you have a holed diaphragm, the diaphragm simply
can't lift fully. The bike starts arnd runs perfectly, but just lacks
power. It doesn't misfire at all.
Or so my Kawasaki 400 twin did, with holed diaphragms. Top whack was
70mph whatever you did to it. Replaced with nice ones from NRP: top
speed went up to 100.
Please note that my reply is based on personal experience, not
ignorant theorising.
Posted by Greg.Procter on November 3, 2009, 10:21 pm
> I have a Honda Shadow VT1100C 1996 problem, when I accelerate and on a
> certain rev count the bike is miss firing (losing power) when give
> more petrol it go past the miss fire problem. I did replace sparkplugs
> change petrol and oil filters but problem still exists. What else can
> I check to rectify the problem?
Air cleaner filter(s)?
I would dismantle the carburators, blow out the jets and clean float bowls.
Greg.P.
NZ
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