Lean rear cylinder
afm199 at earthlink.net
Fri Oct 2 06:18:26 PDT 2009
Usually one step, but the rear is SUPER lean.
On Oct 2, 2009, at 6:16 AM, Randy Grein wrote:
> There is a jetting differential front to back, can't remember for sure
> which way - but sounds like you need to go up a size on the rear.
> Randy Grein, WMRRA #141
> On Oct 1, 2009, at 10:04 AM, Ernest Montague wrote:
>> My rear cylinder is running super lean for some reason. The header
>> interior is clean and light grey/white with no carbon. I am running
>> pump gas, which always leaves my headers a bit black. But the rear
>> is very light colored, the front the normal blackish. It's not a
>> head gasket leaking water ( at least last time water got in the
>> combustion chamber via head gasket it steam cleaned everything. The
>> chamber just looks lean, valves very clean and grey/tan. I looked
>> for missing vacumn plug, bad slide rubber, plugged main jet, etc.
>> The mains front and rear are 170s a range that has worked well in the
>> past with the M4 system and BMC big mouth race filter (factory pro
>> design). Even if it was the main I can't believe it would be so
>> different from front to back.
>> Also backfires and pops at cruising 2500-4000 rpm.
>> Bike is mostly ridden at full throttle on the track.
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