sf af 500 pipe

[jonny500]

i have priced up a pro circuit pipe cr500 at £270 . so i will probably be going with that. what dose the procircuit pipe soud like?

[kxpegger]

I don't think Service Honda machined the cylinder hose connector on my AF. They just inverted it so the hose connection faces up not down.

Maybe not on yours, but I have seen a post by AJ on either this site or another.   He said that they remove material on the cylinder side.

It looks like you could remove about 7mm on the cyl. and another mm or so on the flange.  I know that would have helped me alot.

I've got a spare brand new cylinder. I'll take a look and compare both cylinders. I hope Service Honda didn't remove cylinder material when it would make more sense to just modify the pipe where it was neccessary.

Checked my new cylinder against the cylinder on the bike. Service Honda did not machine down the cylinder coolant port boss on my AF.

[jonny500]

i have had an idea with regard to putting the cr pipe on the kx. the plan is to make an adaptor to fit between the kx ex port and the cr pipe. it is better explained in a drawing. pic 1 is my idea.
in order to make this part i need the dimensions of the cr exhaust manifold which is No 12 in pic 2
if some one has a cr manifold laying round, could i ask them to tell me what dimensions a,b,c,d,e, and f are in pic3
any help or opinions would be apreciated
thanks john

[ZETTNORCAL]

Sounds like just another place for a leak.  I have 3 cr500's and all of them have problems with the pipe leaking at the manifold.  I would just cut and weld on the kx5 inlet.   My homemade pipe on my SFconversion works GREAT! 

Just my thoughts though.

[jonny500]

your thoughts are welcome zett, thanks. i would say exactly the same 2 joins is 2 places to leak. perhaps i should have given my reasons for this idea. the first is that if i flatten or damage the pipe i will be able to take a cr pipe of the shelf and fit it straight on. the second is that i can adjust the pipe length by make different size adaptors, after all i am using a cr pipe on a kx. i will try this idea and see if i can get it to work as i think the benifits long term are worth having. however if i cant i will weld it. do you have a manifold you could measure, would be much appreciated
thanks john

[BushPig]

Beware the adapter.... there is a company who does some half decent frame conversions for the KX and they mess it all up by using a stock CR500 pipe and an adapter just like the one you're talking about.  The whole pipe gets pushed forward to where the header comes way too close to the front wheel.  For my money, I'd be checking if the Service Honda pipe will fit and just make up some brackets to suit.

Cheers,
Bushpig

[jonny500]

yeah the front wheel clearance is a check i will most definatly be doing before riding

[BDI]

I have been kicking around the idea of just using a kx 250 pipe. The 250 pipe fits the 500 cylinder and I think by cutting and turning a couple of sections it may fit just fine without changing the tuned leangth. Also I think that it may be a benifit to some of us who are using port timming that is closer to a 250 then a 500.

[DoldGuy]

I have been kicking around the idea of just using a kx 250 pipe. The 250 pipe fits the 500 cylinder and I think by cutting and turning a couple of sections it may fit just fine without changing the tuned leangth. Also I think that it may be a benifit to some of us who are using port timming that is closer to a 250 then a 500.

[kaw rider]

brian
Some 250 have low port timing numbers compared to other 250 motor stock from factory. The 250 pipe would work with small port tunnel and different stinger diameter. The pipe would produce more pressue and heat in pipe to make the pipe work the best. Best the way the K5 motor is made.

[junk man]

I used the lower part of a kx500 pipe and upper part of a kx250 pipe and welded them together also used my FMF 500 sparkarrester  look on E:bay  for a cheep 250 pipe to cut up  but the cr500 pipes look like there doing the job

good luck JM