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Message started by diamond jim on 09/24/08 at 19:56:35

Title: Best carb mod starting point?
Post by diamond jim on 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?

Title: Re: Best carb mod starting point?
Post by verslagen1 on 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.

Title: Re: Best carb mod starting point?
Post by diamond jim on 09/25/08 at 08:35:58

I'll try the WOT on a long hill this weekend. Thanks.

Title: Re: Best carb mod starting point?
Post by mikestrikes on 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 !

Title: Re: Best carb mod starting point?
Post by diamond jim on 09/25/08 at 11:38:56

(This is taken from a post in the tech section)

68716F6E60747F681A0 wrote:

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?

Title: Re: Best carb mod starting point?
Post by Rogue_Cheddar on 09/25/08 at 12:30:57

3E333B3735343E3033375A0 wrote:

(This is taken from a post in the tech section)
[quote author=68716F6E60747F681A0 link=1104205157/0#2 date=1104530368]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?
[/quote]

Why, to look cute of course. Didn't you ever hear "Cute as a little dimple"? :D