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Best carb mod starting point? (Read 116 times)
diamond jim
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Best carb mod starting point?
09/24/08 at 19:56:35
 
(This is a new post I started at the recommendation of T Mack 1.  I asked this ? on another post.)

Okay, I've read the Carb 101, Carb Primer, Carb Specs and have perused the forum for carb tuning info.

Prior to this point I had:
  • removed the white spacer
  • did the brass plug/idle mixture thing
  • It idled and ran fine with backfiring after about 3 seconds of hard decel from higher engine rpm

I've since taken the bike apart to do some good modding.  Among these mods are:
  • installed sportster muffler
  • changed to a pod filter

Sitting in my lap at this very moment is the Jetset pack.   I've read on here were some have changed the main jet but left the stock pilot jet.  Others have changed both.  I see all 3 of the main jet sizes being used.  I've seen some on here with the white spacer removed and some with usually 2 washers in it's place.  I see a myriad of possible configurations. I didn't see a good, solid beginning setup recommendation.

What is a good starting point to start tuning the carb?

I'm thinking new pilot jet, 152.5 main jet and leave it with no spacer.  Somebody tell me if this a good middle ground to start tuning and look for a rich or lean condition or should I start with a different configuration?
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verslagen1
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Re: Best carb mod starting point?
Reply #1 - 09/24/08 at 21:13:04
 
good place to start from... stock.
adj idle mix, if less than 3 turns leave it, otherwise upsize it.
test main, go up a long steady hill at wot, if you back off and it picks up, upsize the main.
repeat as necessary.
check plug color often.
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diamond jim
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Re: Best carb mod starting point?
Reply #2 - 09/25/08 at 08:35:58
 
I'll try the WOT on a long hill this weekend.  Thanks.
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mikestrikes
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Re: Best carb mod starting point?
Reply #3 - 09/25/08 at 09:22:37
 
I always start at the top and work down.

Start with the main jet, then the needle size and position and or the spring under the diaphragm, then the  pilot jet, end at adjusting the low mix screw !
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diamond jim
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Re: Best carb mod starting point?
Reply #4 - 09/25/08 at 11:38:56
 
(This is taken from a post in the tech section)
rkutzner wrote on 12/31/04 at 13:59:28:
Only remove 1/2 of the spacer at first or at least replace with one or 2 #4 washers so that the dimple in the plate can do it's job...


What is the dimple's job?
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Rogue_Cheddar
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Re: Best carb mod starting point?
Reply #5 - 09/25/08 at 12:30:57
 
diamond jim wrote on 09/25/08 at 11:38:56:
(This is taken from a post in the tech section)
rkutzner wrote on 12/31/04 at 13:59:28:
Only remove 1/2 of the spacer at first or at least replace with one or 2 #4 washers so that the dimple in the plate can do it's job...


What is the dimple's job?


Why, to look cute of course. Didn't you ever hear "Cute as a little dimple"? Cheesy
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'95 Red Savage. Oring grips and pegs, 30" Fishtail muffler,152.5 main, 1/3 spacer mod ,seat lift, Verslagy.
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