T
tirebiter
Guest
When I read Blompod's "Not Idling?" thread it reminded me about something I found when I checked the intake to carb fit my bikes. That might not be his problem tho.
Here's something I found on all my kits. If you assemble the intake and the carb just the way they come, the carb can't fit all of the way onto the intake tube. There's a pretty good sized leak at the bottoms of the grooves in the carb flange. Each kit's a little different but on the one in the pics the tube can only go into the carb .420" before it hits the weld on the tube. The grooves are .500" long which leaves .080" of the groove uncovered. The clamp on the outside doesn't cover the grooves either but that doesn't really matter because air will leak down the grooves anyway if the carb doesn't slip on at least past the ends of the grooves. Air leaks on the intake are not good.
On the bike I ride I smoothed the weld all the way to the bend and also ground a little off the end of the carb flange. That way I could slip the tube in until it bottomed out. Maybe I'm a little fussy but I thought I'd bring it up in case someone else is fussy too.
Here's some pics of the measurements I just took off a fresh kit.
Carb
Here's something I found on all my kits. If you assemble the intake and the carb just the way they come, the carb can't fit all of the way onto the intake tube. There's a pretty good sized leak at the bottoms of the grooves in the carb flange. Each kit's a little different but on the one in the pics the tube can only go into the carb .420" before it hits the weld on the tube. The grooves are .500" long which leaves .080" of the groove uncovered. The clamp on the outside doesn't cover the grooves either but that doesn't really matter because air will leak down the grooves anyway if the carb doesn't slip on at least past the ends of the grooves. Air leaks on the intake are not good.
On the bike I ride I smoothed the weld all the way to the bend and also ground a little off the end of the carb flange. That way I could slip the tube in until it bottomed out. Maybe I'm a little fussy but I thought I'd bring it up in case someone else is fussy too.
Here's some pics of the measurements I just took off a fresh kit.
Carb