KX Riders
Maintenance & Technical => KX500 Steel Frame Conversion (SFC) => Topic started by: jonny500 on September 09, 2010, 07:20:56 AM
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i just emailed service honda for a price on the kx500af pipe posted to the U.K and this is the reply i got
HELLO THE PIPE IS 229.00 THE SILENCER IS 119.00 AND SHIPPING IS JUST AT A GUESS COULD BE 250.00 .COULD BE MORE MAYBE LESS :-o
can any one help that shipping price is crazy and would rule it out. i am building a 99-02 250/500 sf and need some ideas on a pipe i need it to look good. my welding/fabrication skills are limited. i do have a fmf gold series for the standard bike, any help would be greatly recieved
regards
john
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pay the money it's worth it.
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it works out to $600 or around ?400. i may be able to have somthing custom made for that sort of money
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is the fit and finish going to be the same, plus the down time for a pipe to be made.
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. i know what you are saying they are a lovely looking pipe. has any one fitted 1 to a 02 250/500sf do you know. there would be some modification i know. its not the price of the pipe thats ok its the shipping that bothers me. i can get cr500 pipes over here what mods do they need
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. i know what you are saying they are a lovely looking pipe. has any one fitted 1 to a 02 250/500sf do you know. there would be some modification i know. its not the price of the pipe thats ok its the shipping that bothers me. i can get cr500 pipes over here what mods do they need
Weld a KX500 header to the CR500 pipe. You may also have to provide some additional clearance on the pipe for the water pump hose or you could invert the cylinder hose connection and use a Service Honda hose. It's a "U" shape near the cylinder connection instead of the stock straight hose and moves the hose more to the front of the bike providing more clearance. As far as any frame issues go on the steel frame with the CR500 pipe for mounting mods or clearance issues I can't help you with that question.
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thanks kxpegger. as far as i am aware the service kx500af pipe is just a cr500 pipe with mods any way. can i ask if you used a cr500 pipe on your af. can you recomend a manufacturer for the cr500 pipe.
many thanks
john
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I used a CR500 pipe and modded it, I've also used a KX500 pipe and modded it and I've used the service Honda pipe, performance wise there isn't a nickels worth of difference.
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Service Honda machines the cyl. where the water port is on the KX500af's to make the port tighter to the cyl. If you look at the cyl. casting it looks like they have taken off about 10mm for more pipe to cyl . clearance as well as inverting the same port. So if you buy one of their pipes and think that it will solve that water port issue it won't.
The fmf that they sell is modded some in that area but will still need to be dented in unless you do some machine work on the cylinder like they did.
I think that the PC pipe is a better fit than the FMF any way. I used the PC cr5 pipe with the k5 inlet and then put a HUGE dent in it for the water port. I can say that is not the way to do it.
If you look close you can see the HUGE dent. Also check out the part of the cylinder that could be machined for a tighter fit.
(http://i842.photobucket.com/albums/zz346/ZETTNORCAL/KX500015.jpg)
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thanks don and zett. don, can i ask how you mounted the cr pipe to the 02 chassis was there much work and did you have to move the mounts on the pipe.
i think i am going to go with the cr 500 pipe and muffler and modify it. i think i can do it for half the price of the S.H.
i will be doing the cylinder machining
are you saying the pc pipe is the best. zett
thanks all
john
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I have a few old FMF cr5 pipes, stock pipes, and PC ones. (have a few CR5's) So I test fit all of them on my 04 kx250f-KX5 conversion. The stock CR500 pipe had the best fit with the best water port clearance. But I just did not have the heart to cut up real nice cr5 pipe. So I used the next best fit. The PC pipe.
ZETT
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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. The pipe that is on mine is made by FMF for Service Honda's KX500AF. There is a modification where it looks like they removed some pipe material and welded it back up on the original pipe that came with the bike. I bought a spare pipe from Service Honda about a year later and the spare does not have this modification and looks to be all CR500 original with just a KX500 header welded on it.
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thanks don and zett. don, can i ask how you mounted the cr pipe to the 02 chassis was there much work and did you have to move the mounts on the pipe.
i think i am going to go with the cr 500 pipe and muffler and modify it. i think i can do it for half the price of the S.H.
i will be doing the cylinder machining
are you saying the pc pipe is the best. zett
thanks all
john
The pipe that is shown on the 02 framed 500 is a kx pipe that was modded to fit, dimensionally it is the same just cut and twisted. on my 250f steel framed 500 I use a CR PC pipe and like Zett, I also dented it around the water spigot, I also ground down the flange to gain as much clearance as possible, the other thing I remember seeing was a block off plate there and the water manifold moved to the back of the cylinder like the 250's. I don't have any performance issues with the dent, although I'm sure there are some, Zett is also correct that even if you bought the service honda pipe you would have to dent it as well, there is not enough clearance as is. having said all this I would use the CR500 pipe and modify it it works well and I think it will work well with your 250.
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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.
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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.
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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?
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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.
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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
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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.
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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
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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
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yeah the front wheel clearance is a check i will most definatly be doing before riding
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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.
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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.
:-D
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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.
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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