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So I have had two Katanas thus far and recently bought an RF900R that I am having trouble with. Seeing as it is so similar to the kats I figured I would ask questions about this bike here since I don't seem to be able to find any forums for the bike.
I got it, changed the oil, replaced the plugs, put a fuel filter on the feed line for what seems to be a fuel pump (petcock -> round cylinder under seat -> carbs), and disassembled the carburetors to clean them. I used carburetor cleaner (1.5 cans), wire brushes, carburetor cleaning needles, and compressed air. Reset the air/fuel screws to 2.5 turns out and went to fire her up and she started right up! Was able to turn the choke off after a 20-30 seconds and she purred along at 1100RPM -- I could blip the throttle and it would rev up then come back down without any significant amount of hanging/surging/bogging.
The problem is that once the bike warmed up and as it continued to run it started running like absolute crap, missing and requiring throttle to start/idle. I tried disconnecting the main fuel line and starting it several times until it wouldn't fire anymore but that didn't seem to help. Any ideas guys?
My guesses:
-Vapor lock? -- Not sure because fuel filter was still wet and at least half full of fuel.
-Valve adjustment -- The valves definitely need adjusted -- there is some serious tippity-tap going on on the brake side of the motor. I can't imagine this making the bike run like garbage though.
-Heat-related ignition issue -- always a possibility I suppose.
-Heat-related vacuum leak -- tear in the intake boot or something that starts leaking more when the engine gets warm.
Any ideas guys? point me in the right direction. Oh, and another relevant symptom is that I have noticed the carbs fart air and occasionally fuel back out of the throats.
Regards,
-Duo
I got it, changed the oil, replaced the plugs, put a fuel filter on the feed line for what seems to be a fuel pump (petcock -> round cylinder under seat -> carbs), and disassembled the carburetors to clean them. I used carburetor cleaner (1.5 cans), wire brushes, carburetor cleaning needles, and compressed air. Reset the air/fuel screws to 2.5 turns out and went to fire her up and she started right up! Was able to turn the choke off after a 20-30 seconds and she purred along at 1100RPM -- I could blip the throttle and it would rev up then come back down without any significant amount of hanging/surging/bogging.
The problem is that once the bike warmed up and as it continued to run it started running like absolute crap, missing and requiring throttle to start/idle. I tried disconnecting the main fuel line and starting it several times until it wouldn't fire anymore but that didn't seem to help. Any ideas guys?
My guesses:
-Vapor lock? -- Not sure because fuel filter was still wet and at least half full of fuel.
-Valve adjustment -- The valves definitely need adjusted -- there is some serious tippity-tap going on on the brake side of the motor. I can't imagine this making the bike run like garbage though.
-Heat-related ignition issue -- always a possibility I suppose.
-Heat-related vacuum leak -- tear in the intake boot or something that starts leaking more when the engine gets warm.
Any ideas guys? point me in the right direction. Oh, and another relevant symptom is that I have noticed the carbs fart air and occasionally fuel back out of the throats.
Regards,
-Duo
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