BannedCR500Riders.com

gregrobo wrote:

ChumlyRocksa540 wrote:It's not hard if you make your measurements perfect then it's just welding

shit that easy

Post some pictures of the pipes you have built

welding would be the easy part of the whole job. alot of discussion on other sites if a computer program can make the perfect pipe. some say yes and others say its just a tool to help

There's a few pipe building programs out there, even free, one from IWT racing, you need to be able to provide the program alot of info, then if you get that part right you need to make the cones, there are also free prorams for that, still a major undertaking. people spend a lot of time building pipes that should work then making revisions and tweeks, I may attempt it some time but I don't know when I'll get that sort of time to screw with it, would need a dyno along with other data acquisition systems to really tell if you were making head way. kinda off topic here
original topic was home porting, I say go for it, just take it easy, smooth out casting transitions and imperfections, Here is some info from Eric Gore, on the cylinder:
"The hook angles of the rear transfer ports should be filled with epoxy so the transfers are aimed at each other instead of towards the exhaust port. the narrower the port, the sooner the smoother the low end power. The minimum chordal width of each rear transfer port is 10mm. Raise the exhaust port 1.5mm and widen the two ports 4mm on each outer edge. The steel sleeve should be matched to the aluminum casting because it is very rough from the original manufacturing process. Polish the port edges with fine grit sanding paper. that will improve piston and ring life."

Let us know if you do any of this and how it comes out, I have not been able to find this info on Eric's site lately, I think he no longer is interested in giving away his secrets.

not sure why chumly mentioned the pipe bullshit. acts like its simple as making loaf of bread . i guess everything is easy when your breathing sea foam fumes all day

best way a first timer could learn is buy a $100 bike off craiglist and grind on that jug

I had an '87 cr250 ignition on an '86 motor and it was insane. the newer ones are much tamer.
The day after I added the cdi I took the bike out to armagosa and looped it out while launching up the hill. There are pics aomehere of me riding the rest of the day with no rear fender

the 86-88 cr250 cdi used the same flywheel and stator as the '86 cr500. If you bike is not an '86, to get the same year range you'll need the flywheel and stator as well as the cdi.

so many benifets to digital 250 ignition easier starting, less vibration, less flywheel inertia

100hp honda wrote:not sure why chumly mentioned the pipe bullshit. acts like its simple as making loaf of bread . i guess everything is easy when your breathing sea foam fumes all day

I havent done a pipe by myself but iv helped build one and I don't think it's the easiest thing to do but if he wants a 1000 more rpm on top it would be the safest (it won't screw up the jug permintly) way to do it no one really makes a rev pipe for a cr500 from the way I understand it the expansion chamber work simlar to a cam in the aspect of controlling the where and way power comes on so radical pipe:radical cam

ChumlyRocksa540 wrote:It's not hard if you make your measurements perfect then it's just welding

So how much are you charging for your kitchen table pipes? I've had trouble in the past, trying to exhaust gases at the table, maybe your pipe will help "de-tune" others around me?

jbsleddin wrote:

ChumlyRocksa540 wrote:It's not hard if you make your measurements perfect then it's just welding

So how much are you charging for your kitchen table pipes? I've had trouble in the past, trying to exhaust gases at the table, maybe your pipe will help "de-tune" others around me?

That's some funny shit right there!

Correct me if I'm wrong, but you said "no one makes a rev pipe". Isn't that what a CPI or a DEP pipe does,??

Gmbond wrote:Correct me if I'm wrong, but you said "no one makes a rev pipe". Isn't that what a CPI or a DEP pipe does,??

Those are not as radical as you can build and after a little searching I found a few guys that are willin to sell the measurements that worked for them as long as it was just a pipe for your bike and not to sell

from what i heard chumleys 540 was tuned so badly that a xr200 would outrun it....
i wouldnt take advise from that kind of character

chumly should hang up his boots and part out that bike. i got first dibs on the cylinder

wheres the pic of that lt250 cylinder.... you know the one

2strokeforever wrote:wheres the pic of that lt250 cylinder.... you know the one

I thought that was an LT500 cylinder?

That's awesome, are the blue areas where more material needs to be removed

That pic makes me cringe every time I see it.

AlisoBob wrote:That pic makes me cringe every time I see it.

oh no!