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F has no hi speed

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mikeyboy1

F has no hi speed

took my F out today.runs fine up to about half throttle,then breaks up.back off it,she's fine. now here's the wierd stuff.checked timing.no matter how much I advance or retard the plate nothing changes.took out the advancer-it's clean & appears to be working fine.
dont know if the two issues are connected.why doesnt turning the timing plate-the plate the points mount on-do anything ?any ideas?

Re-run

Re: F has no hi speed

Administrator

Do you have a timing light? Set the timing static, then start and rev. The manual specifies when full advance should happen, something like 2500 rpm. Verify that it opens at that rpm and not too soon or too late.

From there, I would pull the plugs and see what the insulator looks like to make sure things are not too lean. That can be a symptom of being too lean.

The ride IS the adventure. The destination is just to get gas!

eric moon

Re: F has no hi speed

Sounds more like carbs need sorting. I have one set that idles ok but no good after half throttle and another set that is no good at idle but great at full throttle. I am going to thoroughly clean both sets so hopefully have two fully working sets for my two bikes.

1980 CB750F S/S
1979 CB750F
York
England

Re-run

Re: F has no hi speed

Administrator

It is possible it is the carbs. Since he only has 1 set, it best to start at the beginning. Timing advance can cause this issue and is easy to check.

PLugs will tell him if he is running too rich or too lean. And can then tell him exactly where to look on his carbs to fix.

Besides, pulling the carbs right away is a pain in the ass, especially if it turns out to be something else.

The ride IS the adventure. The destination is just to get gas!

gkmaia

Re: F has no hi speed

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mikeyboy1

Re: F has no hi speed

well I put in 110 jets from my K & it flies ! but it blubbers a little & after a half hour drive it fouled a plug.so I'm gonna put 105's in it as I believe this is what they call for. 98's were in it

TOOLS1

Re: F has no hi speed

Administrator

Yes the 77-78 F had 105 mains. 98's would have had that bike starving.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

Re-run

Re: F has no hi speed

Administrator

Should have said that in the first place! Even the 105s are almost too lean. I guess it wasn't really asked either.

The ride IS the adventure. The destination is just to get gas!