stage 1 jetting
stage 1 jetting
i know this has been discussed before but here goes........
i have an 02 stock 88 tc with SE air cleaner with k/n filter. also have v and h short shots. anyone with similar stuff, what jets are you running? did you need to put the Sporty needle in it?
thanks for the assistance
i have an 02 stock 88 tc with SE air cleaner with k/n filter. also have v and h short shots. anyone with similar stuff, what jets are you running? did you need to put the Sporty needle in it?
thanks for the assistance
Road Master
Joined: Jul 2005
Posts: 916
Likes: 3
From: Mauldin, SC
RE: stage 1 jetting
This is part of an article from American Rider magazine by Joe Minton from 2003. I did this on my 03 after trying a Dynojet kit and it worked great. The Shortshots may cause you a problem getting the carb right, but this worked for me with Cycle Shack slip ons and a Pro Pipe.
To get your Harley's stock carb right, follow these instructions:
l. Buy and install a stock jet needle for a 1988 or '89 1200 Sportster (H-D Part No. 27094-88). This needle was developed for the early Sportster Keihin CV carb that was not equipped with an accelerator pump. As such, it is richer in the off-idle to 1/4-throttle range and works just right.
2. Remove the soft aluminum plug covering the idle mixture screw. Back the screw out to slightly richen the idle mixture (1/2 to 1-1/2 turns will do it).
DO NOT do any of the following:
Do Not change the main jet; the stock one is just right with a free-flowing air cleaner and mufflers. Yep, the stock main jet is rich. If you find this hard to believe, use the main jet test in the Mikuni manual to see for yourself. You see, the main jet size is not controlled by emission testing and the government is not very interested in mixtures at full throttle. The factories are free to use any main jet they want and, for some reason, all the stock bikes I have tuned over the past 25-plus years have had somewhat rich main jets, including Evo and Twin Cam Harleys.
Do Not change the slow jet; the stock one is just right with an open air cleaner and free-flowing mufflers.
And Do Not install straight, open pipes, especially long ones. If you do, forget everything I've said. Straight open exhaust-equipped engines run poorly in the 2,000- to 3,500-rpm range and no amount of carb tuning can fix that.
-- Joe Minton
To get your Harley's stock carb right, follow these instructions:
l. Buy and install a stock jet needle for a 1988 or '89 1200 Sportster (H-D Part No. 27094-88). This needle was developed for the early Sportster Keihin CV carb that was not equipped with an accelerator pump. As such, it is richer in the off-idle to 1/4-throttle range and works just right.
2. Remove the soft aluminum plug covering the idle mixture screw. Back the screw out to slightly richen the idle mixture (1/2 to 1-1/2 turns will do it).
DO NOT do any of the following:
Do Not change the main jet; the stock one is just right with a free-flowing air cleaner and mufflers. Yep, the stock main jet is rich. If you find this hard to believe, use the main jet test in the Mikuni manual to see for yourself. You see, the main jet size is not controlled by emission testing and the government is not very interested in mixtures at full throttle. The factories are free to use any main jet they want and, for some reason, all the stock bikes I have tuned over the past 25-plus years have had somewhat rich main jets, including Evo and Twin Cam Harleys.
Do Not change the slow jet; the stock one is just right with an open air cleaner and free-flowing mufflers.
And Do Not install straight, open pipes, especially long ones. If you do, forget everything I've said. Straight open exhaust-equipped engines run poorly in the 2,000- to 3,500-rpm range and no amount of carb tuning can fix that.
-- Joe Minton
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