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General Category >> Rubber Side Down! >> Jetting and exhaust question
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Message started by gerald.hughes on 03/03/09 at 10:46:26

Title: Jetting and exhaust question
Post by gerald.hughes on 03/03/09 at 10:46:26

I have an 03 LS650 that I have left pretty much stock. I have a K&N filter, but have not yet put it on. I am seriously considering a Super Trapp pipe, simply because it can be tuned, and seems to have a good rep.

I have two questions really. First, if I install the K&N and the Super Trapp, how many baffles should I install for good flow, but maintaining the proper back pressure?

Second, if I do the above, I know that I will need to rejet the carb. What size jets would you recommend.

All advice is greatly appreciated.

Title: Re: Jetting and exhaust question
Post by BurnPgh on 03/03/09 at 11:26:36

New to the exhaust aspect myself but from what I gather rejetting isnt necessary with a supertrapp if you're using the correct number of baffles.

Title: Re: Jetting and exhaust question
Post by justin_o_guy2 on 03/03/09 at 12:02:45

You CAN use the Trapp to keep the restriction at stock levels, But WHY?? Spend all that $$ & gain noting? No way.
Jetting is different for each bike it seems, Your location, Feet above sea level, changes the equation,too.
You can use enough baffles to mess things up, but figuring this out is, for me, too tedious, so I slapped it together & Im reasonably happy, If I had the OOOMPH id worry about the last 20% of power I could wring out,.

Title: Re: Jetting and exhaust question
Post by gerald.hughes on 03/03/09 at 12:22:48

I understand that I can put sufficient baffles (4-6) into the exhaust to maintain the stock flow, but that is not what I am after. I guess that I should have been more specific, and provided more information. I live in Tucson, which is about 2000 feet above sea level. I want to maximize the possible flow with the Super Trapp and he K&N air filter, but I also want to maintain the back pressure needed for proper flow.

Title: Re: Jetting and exhaust question
Post by justin_o_guy2 on 03/03/09 at 13:00:35

Now youve handed the smart guys the nfo they need to give you an idea where to start. Good luck & I think thats a great approach

Title: Re: Jetting and exhaust question
Post by justin_o_guy2 on 03/03/09 at 13:04:19

OHH Yea, a cam,, stick a cam in it when you do the chain..It gives about 1/2 the midrange boost as the exhaust/airflow/jet boost, I think, anyway.

Title: Re: Jetting and exhaust question
Post by seviersavage on 03/03/09 at 14:03:15

here is my guess.
I would put the eight discs the supertrapp comes with, then do the white spacer mod and up the pilot to whatever Lancer sends ya and go with a 150 main and hold on!
Seviersavage

I ended up going down to 10 discs from 14 but I have a different carb.