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General Category >> Rubber Side Down! >> mikuni carb, jets, sea level, exhaust combos???
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Message started by pmanntex on 09/17/06 at 07:56:17

Title: mikuni carb, jets, sea level, exhaust combos???
Post by pmanntex on 09/17/06 at 07:56:17

lots of info here on various threads about the rejetting of the carb in combination with .

What I haven't been able to tell is what jet setting (and what kind of jets---mikuni or dyna) people have used in combination with other variables such as a. model carburetor, b. their relationship to sea level (which impacts oxygen flow), c. exhaust system being used.

For those that have done their mods, could you please post this type of info for us newbies?? ???

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by Savage_Rob on 09/18/06 at 06:37:15

I'm not against anyone posting this stuff but I seriously caution against using it. Not only environment or the specific combinations of intake and exhauist equipment differ but each carb can be slightly different too and trying to use 1.5 turns or 2.25 turns, etc. is really silly. The best bet is to understand the tuning sequence and use that for your bike and remember to retune if conditions (intake, exhaust, elevation, etc.) change.

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by Dynobob on 09/18/06 at 17:36:44

It really depends on what mods you've done. Different exhausts require different jetting because of varying backpressure. Opening your intake or installing a freer flowing air filter will require richer jetting. You can get starting recommendations here (jetting for most exhausts have been posted). If you can't find what you're looking for, ask. Altitude changes jetting but to what extent, I don't know. We have some members who live at altitude...just ask.

Most here run the original Mikuni CV carb and use large round Mikuni jets. Some have installed the jet kit from Dynojet. Everything is included in the kit but it's quite a bit of $$$. You can get perfectly good results by installing a bigger main jet and shaving the white spacer that's above the needle. That's what most here have done.

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by thumperclone on 09/18/06 at 19:13:51

im at 4500' asl ..runnin 141.3 main # 60 pilot (still fiddlin with the mix screw> see lancers straight & simple carb tuning) k&n drop in,de snorkeled air box,hard krome muff...
runs fine gripes and b.f. @ throtle snap close if reved up.
save your money dont bother with the dyno jet kit only thing i used was the neddle cause it has an adjustable clip....btw stock bs 40 carb

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by Savage Librarian on 09/19/06 at 13:29:28

I'm at sea level. I run a Sportster muff, drop in K&N filter, 152.5 main jet in the stock carb, and I have no idea what the idle screw is at. I just kept working with it until it was 'just right.' Of course, I'm not as meticulous about keeping track of such things as many members here are.

I do belive that savage_rob has the right of it. Each bike is different from the others in small ways, so even working at the same altitude, etc. with the same settings, the bikes will probably run a little differently. Playing with it, tinkering with it, and experimenting are all part of the fun!

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by Reelthing on 09/19/06 at 14:21:11

right there with you at sea level - so let's see we now a three sides of houston covered!

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by azjay on 09/20/06 at 07:54:13

we're at +300', but the low desert requires air cooled jetting, a little on the fat side to protect against the heat. my signature has a complete list of mods i've done.

Title: Re: mikuni carb, jets, sea level, exhaust combos??
Post by pmanntex on 09/21/06 at 10:23:32

Appreciate the feedback received so far on this---the first thread I started.

Went to the stealership to order some jets to play with on the Savage in combination with a Dyna muffler I picked up off of Ebay . . . and made a mistake----sat on a brand spanking new S50!

Hate to admit, but its got me thinking seriously about going in another direction. ???