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General Category >> Rubber Side Down! >> jetting on ls650
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Message started by proangler on 03/04/08 at 09:43:04

Title: jetting on ls650
Post by proangler on 03/04/08 at 09:43:04

I have a 1987 LS650. I want to put a KN style cone filter on it and possibly do something with the exhaust. I believe the jet in 1986-1987 were .155 instead of .145 (which they changed to for emissions reasons.) What size should I upgrade to if I only use a cone filter, or if I run a cone filter along with a straight exhaust.

any down falls to running it with only the main exhaust with the propper jets? will it sound like crap and major loss of hp?

Title: Re: jetting on ls650
Post by Reelthing on 03/04/08 at 10:20:55

first off we're going to get beat up for posting and answering questions in the tech section - we should be in the rubber side down forum - none the less anyone with a handle of "proangler" is a friend of mine!

well the '87s are pretty different carbs - some have a 3 slot needle so you can adjust the midrange mixture without hacking down the white spacer like we do on the later model bikes - you likely are going to need to have a look at a newly installed spark plug to decide if you need to do anything at all as you change things - a rule of thumb might be 1/2 jet size for the k&n and 1 jet on the pipe on the - i'd pick up a 157.5 and a 160 before I started messing with it and several of the cheap champion spark plugs to judge the mixture - also check out the carb101 posting in the tech section

Title: Re: jetting on ls650
Post by Savage_Rob on 03/04/08 at 10:51:27

Yup. In this case, it's the sticky post near the top of the Technical Documents/Reference forum entitled Posting Guidelines: DO NOT POST QUESTIONS HERE!. Obviously, I've moved this thread to its appropriate location.