QuestionHi, I have a 84 honda magna 700. I have just replace the all jets in the float bowl, the floats, and clean/re-seat the diaphrams on all 4 carburetor. I also replace plugs and change oil and air filter. The bike now starts instantly everytime and idles perfect.
The problem is when I open the throttle to 5 k rpm or higher, the bike hesitates and bogs big time. It has plenty of power up to 5k rpm on all gears. I fully open the throttle and it then sometimes sputters and accelerates to high rpms but more often it sputters and DECELERATES, loses power and my rpm goes downhill... I tried to adjust fuel mixture screw and it still bogs. I tried to choke it while running at 5k rpm or higher and it made no difference.
I know all 4 carbs are getting fuel by opening the fuel drain screw and gas pours out on all 4. This problem existed BEFORE I cleaned the carbs. Before I cleaned the carbs, it would not run on idle and was really hard to start so I pour in a total of 2 bottles of fuel injector cleaner for 2 consecutive gas refills. After that, the bogging problem arised. Now the problem still exist after I clean the carbs and ran two tanks of clean 92 octane fuel.
I have NOT clean the pilot needle since I don't think that would cause the bogging. Now I'm thinking too concentrate solution of fuel injectors cleaner has damaged my carbs...or something else is causing the bogging? I have not sync the carbs. I would think sync the carbs would not solve the problem. I have not replace the spark plugs wire either. maybe the wires are arching and cause the bogging?
any suggestions would be greatly appreciated.
thanks, bruce
AnswerHi Bruce,
Q: The problem is when I open the throttle to 5 k rpm or higher, the bike hesitates and bogs big time. It has plenty of power up to 5k rpm on all gears. I fully open the throttle and it then sometimes sputters and accelerates to high rpms but more often it sputters and DECELERATES, loses power and my rpm goes downhill... I tried to adjust fuel mixture screw and it still bogs. I tried to choke it while running at 5k rpm or higher and it made no difference.
A: Verify throttle slides are raising. Check throttle slide diaphragms for defects, tears, pinholes, etc.. Hold to light and gently pull diaphragm away from center. Look for light through diaphragm.
Q: Before I cleaned the carbs, it would not run on idle and was really hard to start so I pour in a total of 2 bottles of fuel injector cleaner for 2 consecutive gas refills. After that, the bogging problem arised.
A: Pilot circuits were obstructed by varnished gasoline. Bogging is indication of excessively rich air-fuel mixture. Check air obstructions, too. Injector cleaner additives have an effect on the air-fuel mixture and may have fouled the spark plugs a bit. These cleaners will not restore proper performance. They just do not work well. Carburetors need to be more thoroughly cleaned, including air-fuel screws.
Try cleaning the carbs again. You must check and adjust synchronization. Send me an email. I'll return numerous files on carb cleaning, tuning, and synchronization. Read spark plugs to determine if air-fuel mixture is rich/lean.
My email is: mshively1@woh.rr.com
Respectfully,
Mark Shively
