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General Category >> Rubber Side Down! >> Reading the SuperTrapp
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Message started by geo on 07/27/06 at 20:03:42

Title: Reading the SuperTrapp
Post by geo on 07/27/06 at 20:03:42

I have a SuperTrapp exhaust on my LS650. I rejetted the carb with a Dynojet DL144 main. Now, the Dynojet kit replaces the needle and keeps the stock white washer. I don't know how the Dynojet DL144 compares with other main jets available.

What I have is black soot accumulating on my SuperTrapp discs. So, I think I'm running too rich. I ordered another 6-pack of discs, and I'm planning to add 2 more discs to lean it out better.

I'm looking for someone who has been through this, and what their solution was. ???

Title: Re: Reading the SuperTrapp
Post by Savage_Rob on 07/28/06 at 07:29:05

Yes, the DJ needle is adjustable. Try looking at the Mikuni / Dynojet jet size comparison topic in the Tech forum to get an idea of the DJ size. I didn't see a 144 on it; that seems to be off the chart on the small end but Dynojet may have more info on that comparison. I'd suggest spending $3 for the right size Mikuni main jet. I'd try a 152.5 with the Supertrapp; maybe a 155. IMO, the only thing worth keeping from the DJ kit is the needle - and it's certainly not worth the price of the kit.

Title: Re: Reading the SuperTrapp
Post by geo on 08/22/06 at 22:44:09

This DJ144 jet is plenty powerful. I had to add 3 more SuperTrapp discs to 11 to get rid of the black soot.
This thing has scary acceleration now. I still have a sticky needle, and sometimes won't go to higher RPMs.
This happens if I ride a distance at constant throttle.

Title: Re: Reading the SuperTrapp
Post by Dynobob on 08/23/06 at 05:45:54

Savage_Rob wrote:

I'd try a 152.5 with the Supertrapp; maybe a 155.

Yes you're rich. I have a Supertrapp and a 157.5 main jet and no black soot at all. My disks (stock number) are clean and a golden color.

Title: Re: Reading the SuperTrapp
Post by stinger on 08/26/06 at 00:31:30

this supertrapp has got me all confused. the phamplet that comes with it says you dont need to rejet if you dont use more than 8 discs. im running 8 with a k@n air filter and no rejetting. It pops a little sometimes when decelerating but not often and not very loud. Took a major road trip on my 650 (5,000 miles in a month) and pulled the plug when i got home. plug was nice and tan, and what little soot on the discs i could wipe off with my finger. it runs strong and smooth, so how come i dont need no rejetting?

Title: Re: Reading the SuperTrapp
Post by Dynobob on 08/26/06 at 03:28:27

With a K&N and a Supertrapp, you should be very lean. What method did you use to read your plug? Have you owned your bike since new? Perhaps a previous owner did some jetting?