Tuned pipe for OS 21 xm outboard

[Steven Bryant]

Hi Guys

I am looking at changing my outboard from a stock muffler to a tuned pipe however i am not sure what pipe and manifold to go for and where to buy them from, any help would be much appreciated.

Steve

 

[Tony Drake]

Silver Bullet OB Pipes from htbboats.com ........and 707 Specialties

Tony

 

[Steven Bryant]

Thanks Tony, what length would you run the pipe at?

 

[Tony Drake]

Thanks Tony, what length would you run the pipe at?

never really measured my outboard i just cut a little at a time till i picked up some topend

 

[Tim leyde]

Has anyone tried a Cooper?

 

[racejunkie538]

The Silver Bullet Pipe is indeed a good pipe on the OS, but brings nothing extra on a stock engine.

They run best with the stock muffler, ask James "Gabe" Clegg.

Rgrds

Marc

 

[Aldana]

Hello, I tried the Silver Bullet Pipe pipe HTB and desire very little if you want better performance work on the propellers, I have good results with x438, x440, also smooth the surfaces of the keel, a good 30% marine fuel. is the way in standard form. To get more power with a pipe must change the times on sleeve.

 

[Steven Bryant]

Thanks for your input guys, i was going to order a pipe this weekend for my OS, in terms of modifying the timing on the sleeve is it easily done? Is there any online resources showing you how to change the timing etc?

 

[racejunkie538]

Steven

You better ask James "Gabe" Clegg. Don't know if he still tunes engines, but sure he knows it all.

Good luck

Rgrds Marc

 

[Dan Hutchinson]

i ran this same combo last year (OS,aircooled silver bullet pipe) i was pleased with the performance i have 2 powerheads both are modded by the same person at the same time, one has the pipe the other stock. the piped OS was clearly faster, i think what i liked the most was the reliabality. was fast and still able to slow down for starts without stalling. anyway i placed 3rd over all in hobart in the open tunnel class, and first place in charleston in mod tunnel. with this combo Dan

 

[Tim leyde]

Dan, was it the HP or original.

 

[Dan Hutchinson]

im not sure. it was part or a complete motor with the pipe already on it. but it was a silver bullet

 

[Tim leyde]

C'Mon Dan, u don't play dumb very good. Hahaha. Just pulling ur leg!

TL