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General Category >> Rubber Side Down! >> Jetting for a Supertrapp
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Message started by Midnightrider on 08/19/09 at 16:13:27

Title: Jetting for a Supertrapp
Post by Midnightrider on 08/19/09 at 16:13:27

I'm fixing to install a Supertrapp. I'm not going to run over 8 disc. Could care less about the noise and I don't want to lose any torque. I'll take torque over horsepower any day. I've removed the cover from the pilot jet and come out 3 turns. I'll probably start off with 7 disc. Would I gain anything by changing the main jet or raising the needle other than burning more gas?

Title: Re: Jetting for a Supertrapp
Post by Serowbot on 08/19/09 at 16:47:03

Assuming that you are relatively close to sea level,... and have an otherwise stock engine...
I would first recommend that you install a foam or k/n fabric air filter to get maximum benefit from the pipe...
Then, because you want to preserve torque and mileage, go one step over stock on the main and pilot, and change to 2/3 thickness on the needle jet spacer... then add or subtract muffler discs for best performance. At sea level, you're already a tad lean with the stock bike.
Unless you are a jackrabbit,... ;D the pilot jet makes the biggest difference in gas mileage.... for every day riding, it shouldn't make more than 2 or 3 mpg difference...

Title: Re: Jetting for a Supertrapp
Post by matt on 08/19/09 at 17:18:11

I have a super trapp with 9 discs in it, im going to get the next size pilot, as i keep the air mixture screw out about 3 to 3-1/4 and i get lots backfire on decel

The main you might wanna go up, i did and noticed a big difference, i have dyno jets (and im about sick of them becasue they use a completly differnt way to number the jets and it confuses the hell out of me comparing them, the needle is great though. over priced?)

Title: Re: Jetting for a Supertrapp
Post by PTRider on 08/20/09 at 07:49:55

6D49444E494748545249444552200 wrote:

I don't want to lose any torque. I'll take torque over horsepower any day.

Just to pick a nit, you can't have one without the other. Torque x movement ÷ time = power. Power gets things done.

What works best is to tune the engine for the max available power at the rpms we actually run at. The shape of the power curve can be changed with engine tuning...intake, exhaust, fuel system, cam profile, etc....and fattening the power curve at mid range rpms is actually the goal that puts smiles on the faces of most of us. Peaky high rpm max power and flat power curve in the everyday rpm range makes for good marketing copy but not the happiest riders.

Title: Re: Jetting for a Supertrapp
Post by Midnightrider on 08/20/09 at 08:12:08

What works best is to tune the engine for the max available power at the rpms we actually run at. The shape of the power curve can be changed with engine tuning...intake, exhaust, fuel system, cam profile, etc....and fattening the power curve at mid range rpms is actually the goal that puts smiles on the faces of most of us. Peaky high rpm max power and flat power curve in the everyday rpm range makes for good marketing copy but not the happiest riders.
[/quote] I've done it before but my experience has always been the more open the exhaust the more torque I lose. Its a lot of trial and error if you're not lucky. I was planning on using the 6 to 8 disc that come with the Supertrapp. I've opened up the pilot and my exhaust has quit blueing. I must be pretty close with the stock muffler. I just wondered if someone was running a Supertrapp with 6 to 8 disc and knew the magic formula. I might eventually do as Serowbot has suggested, order a K&N and open her up. I'll probably have to order more disc. Anybody got any disc laying around they want to get rid of?

Title: Re: Jetting for a Supertrapp
Post by verslagen1 on 08/20/09 at 08:58:03

Supertrapp notes the number of disks to use with stock jetting.
I'd start with that but bump up the jet anyway esp. since you note that it's blueing already, which is way lean. A tad lean and it'll be gold.

The magic formula is to watch your plug, white lean, black rich. You want it light grey or tan.

Title: Re: Jetting for a Supertrapp
Post by yumi on 08/25/09 at 20:03:35

7C6A7D60786D607B0F0 wrote:

and change to 2/3 thickness on the needle jet spacer...

What did you use for a spacer and where can I find one? I read a post that recommended removing the entire spacer, but I'd rather try 1/3 first..

Title: Re: Jetting for a Supertrapp
Post by Midnightrider on 08/25/09 at 20:46:36

Yumi they are using tiny washers. I think they start with 3 washers.

Title: Re: Jetting for a Supertrapp
Post by 12Bravo on 08/26/09 at 06:36:14

I am running 6 disks in my Supertrapp and haven't had to rejet. Mine turned blue but that is because I didn't clean it good enough before starting the bike. Read the instructions because they tell you that if you DO NOT clean the muffler, the oil will cause it to blue. As far as rejetting, it depends on where you live. Supertrapp states that one should be able to run up to 6 disks without having to rejet. Each bike will be different though.

Title: Re: Jetting for a Supertrapp
Post by yumi on 08/26/09 at 17:11:17

73575A505759564A4C575A5B4C3E0 wrote:

Yumi they are using tiny washers. I think they start with 3 washers.

What size washers?

Title: Re: Jetting for a Supertrapp
Post by DrunkenDwarf on 08/26/09 at 18:59:44

#4 worked for me.

-D. Dwarf

Title: Re: Jetting for a Supertrapp
Post by flcruzr on 08/28/09 at 20:11:47

7C7F0F3F2C3B224D0 wrote:

Does this means that we can add a S-trapp muffler without doing anything to the bike?

Title: Re: Jetting for a Supertrapp
Post by Midnightrider on 08/29/09 at 06:17:32

I went ahead and installed the Supertrapp with 6 disc. I've removed the brass plug in front of the idle jet. I came out 3 and 1/4 turns with the idle jet. With 6 disc the Savage is running great. Its not blueing the pipe. For now I'm going to ride. This winter I'll probably get a K&N air filter and rejet everything but while riding season is here I'm putting her in the wind. Seems to be a lot quicker with the Supertrapp.

Title: Re: Jetting for a Supertrapp
Post by 12Bravo on 08/30/09 at 19:16:56

flcruzer,

I had to adjust the air/fuel mix but haven't rejetted my carb. Per Supertrapp's instructions you shouldn't have to rejet if you use 6 or less disks. It all depends on your location and each bike will be different. You will have to adjust your air/fuel mix though. I am running 6 disks and am probably borderline on having to rejet the carb. You can try the Supertrapp with 6 disks and see how it runs, you might or might not have to rejet. Altitude, air temp, and humidity will also determine if you need to rejet or not.