Replacement float valves

flathead · Post by **flathead** » Thu Oct 21, 2010 2:01 pm

Davo,

I got the brass tube from McMaster-Carr. Mine was a BCH smaller than the hole, so I had to expand it by wiggling the shank of a #45 drill in the end till I got a tight fit. Worked great.
Saved 3 unusable bowls.

Mark

davomoto · Post by **davomoto** » Thu Oct 21, 2010 7:16 pm

In technical terms, correct me if I'm wrong, a BCH is .0001mm larger than an RCH. :-)

e3steve · Post by **e3steve** » Fri Oct 22, 2010 3:05 am

Ah, but both are pretty coarse measurements compared to a GCH......

Snakeoil · Post by **Snakeoil** » Fri Oct 22, 2010 10:07 am

Thanks for the feedback. As a former machinist, CH dimensions are known to me, plus I have a conversion chart on the wall should I forget.

Mine is not leaking at the carbs. Both my carbs dribble a small amount of gas out the overflow tubes that are connected to the brass overflow tubes. It leaves two marks on the ground under the bike. So that is why I think it is the worn float needles. And I know they are worn. Actually, probably the most worn of any valves I've seen in all my years of tinkering with engines.

I checked to make sure the floats were free, but the point about the gaskets extruding into the bowl, which was mentioned in another post I found with a search, might be playing a role here. I'm in the process of going thru some maintenance items on the engine now that the riding season is coming to a close so I'll recheck those carb floats for free travel.

Thanks for the tip on CB750F viton tipped float valves.

regards,

Rob

wargoth · Post by **wargoth** » Fri Nov 05, 2010 10:02 am

I want a copy of the CH chart, could you post a pic?