What Drag pipes fit the Cheetah Power valve cyls?

[lt1bird]

Just wondering what drag pipes fit the cheetah powervalve cyl's.....

 

When you see big bore and small bore pipes.....where is the cutoff between whats considered smallbore?

 

Thanks!

[Ruko]

Any banshee pipes will fit... I got my Cheetah 485 from K&T, they said to go with small bores for anything under 500cc. I'm running CPI's they seem to work pretty good.

[lt1bird]

thanks! Just wanted to make sure the exhaust outlet was the same size That 485 kit....Do you like it? Thats what im looking at doing... any issues?? runs hot??

Thanks!

[Ruko]

No issues... runs great. I've had it for 3 years now and love it. The biggest difference is the power never drops off... it pulls right from idle. In fact it almost makes it too easy to ride, me and a buddy were talking about getting some bare bones stock machines to go hill climbing with just to make it challenging again. He has a 421 cub and we are pretty even on top but I have way more low end power. It doesn't seem to run any hotter than before, but I have an oversize radiator and use Engine Ice.

 

Actually the one problem I have had is the bolt inside the power valve that holds the slide to the plunger has come off on both sides... not a big deal... I just put them back together with locktite and they seem to be ok now.

 

If I did it again though I wouldn't get a 485... I'd get either a 421 or a 535. The 421 seems to have almost as much power as the 485 and doesn't require any case machining. The 535 is a +10mm stroke so it needs the cases to be trenched, but you need to get the cases machined to fit the cyl's for the 485 anyway so you may as well trench it and go 535. The 421 is cheaper and easier... but if you don't mind spending the extra for case machining then go for the 535.

[lt1bird]

I have a matoon block so it will not need any machine work...setup for 10mm....... does the 421 only make the same power beacuse its got cub heads? What about a 421 with Power valve heads? would that be a good setup compared to your 485?

[Ruko]

I have a matoon block so it will not need any machine work...setup for 10mm....... does the 421 only make the same power beacuse its got cub heads? What about a 421 with Power valve heads? would that be a good setup compared to your 485?

 

If you are useing cases that will take a 10mm then go with a 10mm. The 421 works well because the transfer ports are not reduced. The bigger you go on the bore the smaller the transfer ports get. There is only so much room between the cylinders so to make the bores bigger they need to make up that space somewhere...

 

I think you need to look into what power valves are and how they work though if you are planning to get some... they have nothing to do with the heads... they go in the cylinders to reduce the exhaust port at lower rpms. Power valves do not effect peak horsepower... they give you more power at lower rpms. There wouldn't be much difference between a 421 and 485 if they both had power valves... the 485 would have a little more grunt in the lower rpms due to the extra cc's but the top end hp would be close to the same.

 

If you can drop a 10mm into those cases then forget about the 421 and 485 and go with a 535. Same as the 485 but with a 10mm crank instead of the 4mm.

[lt1bird]

I think you talked me into the 535

 

Its only a fun bike so im not going cross country etc..... should be fine for crusing around

 

Thanks!