Is HDP and CPI the only ones making "in frame" pipes?

JIM,i've run the HPD blue primary with 40-36 helix and 42-36,it will take a 42-38 with the race pipe to get the rpm in the sweet spot tough with 58 g of weights,mine engage at around 4200 with that spring,top end is awsome but as i said you'll probably end up to 40-42/38 helix,anything higher than 42 initial is for drag race.

AJO, mine is a CPI pipe, I dont know what Rick Ritter offers.Bubba

Scramblered, I'm sorry but I didn't want to misunderstand what you were telling me. Are you saying that is was "tough" to get the rpm in the sweet spot when using the 42- helix? Or are you saying that it worked out ok w/ the 10-58 weights, blue primary, 42-38 helix? If the 42 worked, did you notice any difference over the 40-36 helix, like out of the hole acceleration? Did the 42- helix didn't pull down the motor at all when you tried it? I would never consider going any higher than a 42- helix.
Thanks
Jim

humm,that will depend on your porting job,by my testing done last summer
a 40-36 is for low HP engine,and will only rev the pipe to 7000 rpm,
by putting a 42-38 you'll benefit all the torque response of the proper
porting and it will rev higher to suit the sweet spot line of the race pipe,about 7300-7500,then the 58 g of weights will load the engine enough
to get a great shift out,if it pull the motor down you'll need to consider a stiffer secondary spring tension (less backshift),but the rpm
will stay right up.

i want just to add,always (don't like that word tough...) better to have the less secondary belt spring tension in order to get good power to the ground and performances,as the secondary spring is stiff,the more the belt will slip and backshifting decrease a lot then,but when engines is enough modded for max power,you can sacrifices a little backshift (stiffer sec. spring) to load
more weights into the primary to get a strong upshifting/full shift out of the clutch,but again it depend on your gearing ratio.

Scramblered, will the 42-36 load the engine less than the 42-38? I dont want to risk having the engine pulled down, fall off the pipe, from the helix I choose. I'm planning on using the 42-36 to be safe.
Thanks

Oops I forgot to mention, because of the riding I do, I'd like to stick w/ the primary spring that has the minimum amount of engagement which I think the red is the minimum engagement spring recomended for this setup. So if I use the red primary w/ 10-58 weights I better stay on the safe side & go w/ the 42-36 instead of the 42-38 right?
Thanks
Jim

yes,you should be fine with 42-46 and better to start with,you'll end up
to 42-38 only if you can't get the RPM up to the peak pipe point,
as far the primary spring,the choice is yours where you want it engage depending on riding style and conditions with that combo,but with the 58 g of weights,maybe the powerband will drop a little on top but you should able to get good holeshot tough for trail riding,58 g of weights will specially run good on lower gearing ratio.

I am running the ftr pipe. When I first put it on I was stock except for a clamp on K&N and a 260 jet at 2000 ft. I took off an FMF pipe and it performed about the same. I bought it for the leg heat. Since then I have made numerous changes and kept comparing the fmf and the ftr pipe and everytime I made a change the ftr came on stronger than the fmf pipe. I am running the 44 helix now but I went from the 10-58 weights with the hpd red spring to the 10-56 weights and finally back to the stock weights and putting it under the stopwatch it was a lot better dragging uphill for 450 ft in the sand. If a banshee show up with jsut pipes on as far as looking at one and now extended swing arm then you can rest assured you have a good chance of taking him. Raptors are no problem for the most part there is always going to be an exception out there. My mods are below.[img]i/expressions/face-icon-small-smile.gif[/img]