Messing w the carbs could kill your bike.
And running her too lean could destroy your engine.
OK heres what I been up to these past couple weeks. I feel confident I have all the bugs worked out of these Keihin carbs.
The biggest and most annoying problem I was having was the rich mid range rpms...3800 - 4300rpm zone.
She would pop and cutout...However, above 4500 she runs great.
Watching the O2 sensor I installed I could see she was dropping as low as 9.5 to 1 on the Air/fuel ratio, during the mid range rpm.
Another issue was she was rich when cruising 65mph in 6th gear, (4800 rpm)
So, in order to fix this issue, here is what I did.
|I found the feed hole in the Main Primary tube measured 1.15mm.|
|So, I cleaned them and shoved some flux in there.|
|I filled the tip w solder.|
|Just a guess, I drilled one out to .76mm and the other to .82mm.|
|After making a few laps terrorizing the village. I found the .82mm to be perfect.|
I drilled the .76 out to match the .82mm and viola.
No more popping and she is cruising 65mph at 12 to 1. She doesn't hesitate on take off and returns to idle smoothly approaching a stop. She has tons of power during acceleration, throughout the entire rpm range. And sounds great. Starting from a stop she can reach up to 15 to 1 A/F ratio, as the throttle is cracked. But, only for a second or two, after that Acceleration averages 12 and 13 to 1. All the way to redline.
I am delighted.
So, here is the complete current jetting and mod concoction, I have.
PJs super carb mod Voodoo
new Keyster float needles
Old stock A/F needles and springs
19.5mm float height
old stock 35 pilots
old stock 68 primaries
new keihin 112 secondaires
old stock diaphragms with stock slides
new keyster stock needles and new seats.
new K&N filters, RU-1820