Partial Throttle responce

jt · Post by jt » Thu Apr 12, 2007 12:27 pm

Guys,

I have a 79 with supertrapps and a stock air box with a Tim's paper filter in it. It start's well and idles good but between say 1k and 4k it at a steady throttle it is stumbling or burbling, seems to run better at that rpm with a little choke. So what jet do I need to bump up to? I am not sure what mains I have in I can not remember, I do have the needles shimed about .025 and the pilots turned out 2-1/2 turns. I assume it is the secondary jet I need to increase????

Thanks
JT

cbx6ss · Post by **cbx6ss** » Thu Apr 12, 2007 10:49 pm

Hey JT! Have you sync'd the carbs lately? I just did for the first time in awhile, and was astonished at the improvement.
/r
Brad

alimey4u2 · Post by **alimey4u2** » Fri Apr 13, 2007 5:39 am

Just a wild card here, have you checked the mechanical ignition advancer unit for smooth operation ??

jt · Post by jt » Fri Apr 13, 2007 9:04 am

cbx6ss wrote:Hey JT! Have you sync'd the carbs lately? I just did for the first time in awhile, and was astonished at the improvement.
/r
Brad

I did TRY and sync them, but it was my first time to do so. Maybe would not hurt to re do them and try to get them better.
Thanks
JT

jt · Post by jt » Fri Apr 13, 2007 9:09 am

alimey4u2 wrote:Just a wild card here, have you checked the mechanical ignition advancer unit for smooth operation ??

I put in a Dyna system last summer and everything at that time was working properly and it was acting that way then also. It just feels like I need a little bit richer mixture as it runs smoother with a little choke at that throttle opening. I might have to pull the carbs and check the low speed jets. What effect would going out to three turns on the pilots do?

Thanks
JT