Topic: Loss of Top End Power in 5th **SOLVED** FLOAT LEVEL IN 4TH CARB

[YoungBlood]

Here's the video of the vacuum sync. I think I may have goofed and not ran the bike at higher rpms?? when setting the adjuster screws, and then the idle?

[minimo]

It could affect the whole intake, but it appears, based on your #4 plug and your one less-than-hot exhaust pipe, the issue seems to be particular to a cylinder


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[minimo]

Here's the video of the vacuum sync. I think I may have goofed and not ran the bike at higher rpms?? when setting the adjuster screws, and then the idle?

Be sure to blip the throttle after every screw adjustment to get a better read


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[YoungBlood]

Thanks, I was doing that before hand. This the final cut video of when I was done messing with the screws. Does this look good enough? The manual says ~3 cm hg in between all needles, but mine is in mm markings.

[minimo]

Might also want to check compression across all four cylinders. Loss of power could be piston ring-related also


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[YoungBlood]

Thank you, that sounds like a good idea. I have a friend with a compression gauge I'll reach out to.

[YoungBlood]

This sounds like either:
Fuel is falling low in the float bowls (slow fuel feed from gas tank to carbs).
Bad Daiichi condensors, if points are in use. New Daiichi condensors will be the same (or worse). If you have those, and have some old TEC or Hitachi points plate lying around, install the old condensors from the old plate instead. They don't "go bad".

HondaMan, you were right. I'll never second guess your judgement next time. The float in #4 was set too high, thus a very lean condition starving the bike in 5th. I bent the tab back, richening the mixture, setting float lower. Bike is running great!!!!!! Very happy.

[Alan F.]

That's why someone so many years ago called him by that name and it stuck.