- Joined
- Jun 4, 2013
- Messages
- 106
What I have: A 72 combat that I've rewired with all new harnesses and gone through mechanically to where it is, with 1 exception, a reliable bike. Pazon ignition, all new coils etc. Battery new and load tested. Running stock and I assume original amals that I've thoroughly cleaned (multiple times) and did the rebuild kits on both. Timing seems spot on. New air cleaner with tight seals so no intake leaks.
What is happening: Start 1st kick whether sitting for a couple weeks, or on a hot restart. Idles perfectly, with no fluctuation in rpms. With new plugs (tried ngk 7s last try) is runs great for a few miles, then starts an almost imperceptible hesitation at steady throttle- not constantly, but here and there. No hesitation at all in acceleration. After a few more miles it gets worse (plug is carbon fouling)- yet from a dead stop- you can go through the gears flawlessly with no misses or sputters- but come down to a steady or about 1/4 throttle and it misses again. You can hear right cly cutting in and out. In the 3 years (summers) I've been working on bike, the right has been a troublespot, albeit we put 1500 miles or so on it last year before the problem occurred. Put in a new plug, and the cycle reoccurs.
What I think: Since the problem comes on after a few miles, and disappears under full throttle (and carbon fouled plug) that its a condition of running too rich. But leaning up the air/fuel mixture screw, seems to have to effect on the fouling, although leaning WAY (3,4,5 turns) increases rpms. I'm running the needle setting on the middle on both carbs. My question is this (and Gregs advice about "when Im done messing with those amals, get some Premiers)" ringing in my ears- is it worth trying to rejet, change the needle setting (and isn't this a pilot jet problem) and trying to tune my way out or am I at that point that its just a worn out carb, and I can't tune that out?
Or am I missing something obvious? On my ironhead with a SU carb, a similar problem was traced to a o ring on the enrichener shaft- but the amal really doesn't have such. Is there something else that could cause this?
This last piece of the puxxle is driving me nuts......
What is happening: Start 1st kick whether sitting for a couple weeks, or on a hot restart. Idles perfectly, with no fluctuation in rpms. With new plugs (tried ngk 7s last try) is runs great for a few miles, then starts an almost imperceptible hesitation at steady throttle- not constantly, but here and there. No hesitation at all in acceleration. After a few more miles it gets worse (plug is carbon fouling)- yet from a dead stop- you can go through the gears flawlessly with no misses or sputters- but come down to a steady or about 1/4 throttle and it misses again. You can hear right cly cutting in and out. In the 3 years (summers) I've been working on bike, the right has been a troublespot, albeit we put 1500 miles or so on it last year before the problem occurred. Put in a new plug, and the cycle reoccurs.
What I think: Since the problem comes on after a few miles, and disappears under full throttle (and carbon fouled plug) that its a condition of running too rich. But leaning up the air/fuel mixture screw, seems to have to effect on the fouling, although leaning WAY (3,4,5 turns) increases rpms. I'm running the needle setting on the middle on both carbs. My question is this (and Gregs advice about "when Im done messing with those amals, get some Premiers)" ringing in my ears- is it worth trying to rejet, change the needle setting (and isn't this a pilot jet problem) and trying to tune my way out or am I at that point that its just a worn out carb, and I can't tune that out?
Or am I missing something obvious? On my ironhead with a SU carb, a similar problem was traced to a o ring on the enrichener shaft- but the amal really doesn't have such. Is there something else that could cause this?
This last piece of the puxxle is driving me nuts......
