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Message started by einheit13 on 03/01/10 at 19:13:09

Title: more carb questions...
Post by einheit13 on 03/01/10 at 19:13:09

you guys are probably tired of these....I'm a newbie. My friend bought his wife an S40. She went out and bought herself a fish tail exhaust pipe (straight pipe) and I was wondering if anyone can give me a good base line to re jet, shim, or richen the carb for this set up. Or possibly a different carb altogether?? Also, how sensitive are the bikes to an open exhaust?? Should I baffle it or will it be OK running straight through.

Nice forum ya'll have. Thanks for any help at all.

Title: Re: more carb questions...
Post by Bear on 03/01/10 at 20:02:56

You have to start with a baseline. Is the air filter clean? Has the carb ever been touched by an amateur? If not, find out what size jets are installed now. They have changed over the years. Don't use vented pilot jets - ones with holes in the side. If you do, all bets are off. Pull the spark plug and see if it is blackish - too rich or whitish - too lean. How does it act when riding, hesitations or flat spots?
I'm not fond of open pipes. Gives riders a bad rep. Attracts police. A Harley Dyna muffler is mellow and not expensive - usually $20 good used on eBay.
Generally, if the carb has not ever been messed with, start off with small changes, maybe go up one jet size. Trim or shim the white spacer to half it's stock thickness. Don't go overboard.

Title: Re: more carb questions...
Post by justin_o_guy2 on 03/02/10 at 17:02:24

S-40, 95 at best, lean setup, from the factory. Make it more lean with a less restrictive exhaust? Lookin to cook a motor. Pop a 150 main in, trim the white washer by aboiut 1/3rd, pull the cap on the idla air adjust & set that up to work with the new jets. You may not need the pilot jet.