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Post by Just Plain Bill on Nov 21, 2008 22:47:16 GMT -5
I contacted Jon Easton of Jemco Exhaust Systems, 1919 B Blalock, Houston TX to see about buying one of his SR500 systems. Unfortunately, the only model he makes tucks under the frame, necessitating removal of the center stand. (As shown on Cravethewave13's Flickr page -- www.flickr.com/photos/cameronsr500 ). Jon indicated he could make a system not requiring the center stand be removed if he had a SR500 in house to work with. Anybody in or near Houston with a SR500 he won't be needing for a while (  ) willling to let Jon develop a system for the non-racing SR owner? Don't expect any reward for your service, beyond the satisfaction of having contributed to the well being of other SR owners (and of course if you want to buy the prototype, being the first in your neighborhood to have one). PM me or contact Jon directlly: 713-461-383 or email: info@jemcoexhaust.com Thanks, Bill |
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Post by chew652 on Nov 22, 2008 9:24:21 GMT -5
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Post by Just Plain Bill on Nov 22, 2008 14:48:35 GMT -5
Thanks for the link. Goinwitdaflow makes a nice looking pipe. What was their price for one in stainless (no bend, no muffler)? That would be my choice too since I have a NOS White Brothers Supertrapp. Wonder what's with the shipping date after January. Deus says their designed by CafeRacerCarl pipes will be ready to sell about the same time. By then, we could all be selling apples on the street. Have to agree that a stainless pipe looks better than flat black and the money is always a concern. Have you considered stripping the Thumperstuff header finish and re-doing it with Techline ceramic coating? It's available in a high gloss aluminum color -- you can do it yourself, material costs about $30 thru Eastwood and other places. Or you can have it done by a powder coating company (about $60). The Jemco system (header and muffler) evidently sells for around $225 plus they will nickel plate it (inside and out) for $70. Of course, for now, their system requires removing the center stand.  |
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Post by chew652 on Nov 22, 2008 18:17:21 GMT -5
Bill,PM sent.
Bill
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Post by greymin on Dec 5, 2008 16:29:29 GMT -5
Howdy;
I seem to have made a mistake of some kind. I bought a Jemco pipe years ago and it was $180 unfinished. I got the "street" core, but it should be called the "Hooligan Core" because it is louder than my Rd which has chambers on it.
It bolted right onto the bike and I dint stop to consider if the centerstand would clear, it just does. The center does go under the middle of the bike and goes right through the center gap in the stand. "What a nifty set-up" was my exclamation at the time.
The bike has a disc type rear brake. I must have pulled the core out three or four times to repack it, but it was not needed.
I think it sounds like one of those 20mm anti-aircraft cannon from the Second War. It is at its best when ridden next to one of those tour buses on the freeway. I really like the pipe and would recommend Jemco to anybody.
Grey
...you don't like to start it? Try an IT465...
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Post by Just Plain Bill on Dec 5, 2008 18:19:04 GMT -5
Howdy; I seem to have made a mistake of some kind. I bought a Jemco pipe years ago and it was $180 unfinished. I got the "street" core, but it should be called the "Hooligan Core" because it is louder than my Rd which has chambers on it. It bolted right onto the bike and I dint stop to consider if the centerstand would clear, it just does. The center does go under the middle of the bike and goes right through the center gap in the stand. "What a nifty set-up" was my exclamation at the time. The bike has a disc type rear brake. I must have pulled the core out three or four times to repack it, but it was not needed. I think it sounds like one of those 20mm anti-aircraft cannon from the Second War. It is at its best when ridden next to one of those tour buses on the freeway. I really like the pipe and would recommend Jemco to anybody. Grey ...you don't like to start it? Try an IT465... Great news Grey. Would you mind taking a look at Cameron's setup to confirm it's the same as yours? www.flickr.com/photos/cameronsr500 Jon at Jemco doesn't know that his system will clear the centerstand, but has been very helpful and is willing to design a new model if he can get his hands on a SR500. Sounds like that might not be necessary. Thanks, Bill |
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Post by greymin on Dec 5, 2008 23:58:19 GMT -5
Heyas;
My bike is not like that one, as I have disc rear brake. I also don't have that big hanger or those two silver rings around the can. Mine fastens to that flat spot where the stock muffler fastens under/near the rear brake linkage. Otherwise it looks identical. Mine kinda hangs out to the side like that one at a similar angle, too. Take a look inside if you get one, he has gone to some effort to install some well thought out components to give you a true megaphone that still has some quieting function.
Grey
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Post by Just Plain Bill on Dec 6, 2008 2:22:34 GMT -5
Grey,
Is your engine stock or modified (beyond the pipe)? Do you have an impression as to whether the pipe affected performance of your bike at all? There seems to be an equal chance of lowering performance as improving it with an aftermarket exhaust. I know Jemco claims to increase HP, I guess the question is where in the powerband does it increase -- where in the powerband does it decrease.
Bill
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Post by greymin on Dec 6, 2008 5:56:05 GMT -5
Yo;
This is a bike I got from my dad years ago. I have cut .o50 off of the bottom of the slide, and put in a 330 main jet, and changed the pilot, but I can't remember what it is now. The air filter has no cover on it, and has a KN replacement in there. Piston is second oversize, everything else is stock. I have no dyno and I refrain from claims of power increases without facts. I will say that it runs more "agressively" than with the stock pipe and has less of a "chugging" feel to the way it runs. As for actual running, I ride it to work 25 miles on the freeway, I don't stunt or showboat, and it seems to run easier with less strain over 5 k rpm passing trucks, but that is purely subjective and there is no basis in fact for that opinion. My ignorant belief is that the larger diameter headpipe is the real contributor to increased performance, and this pipe has it. I just checked, and it is 1.75 inches.
y'all be cool,
Grey
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Post by Just Plain Bill on Dec 6, 2008 11:21:16 GMT -5
Thanks Grey, good insights. Yo uh, you've been very helpful. I don't have any facts either and I haven't found a pipe manufacturer yet who posts dyno sheets with his SR500 pipes. But my suspicion is that a louder exhaust makes us more aware of what our engines are doing and we tend to interpret that as better performance. (Yeah I got that from watching the Harley guys -- which I sometimes am.) But as for head pipe diameter and it's influence on HP, I've been looking at a website with the a calculator to determine head pipe diameter and length based on engine CID, desired RPM and exhaust valve opening before bottom dead center. They come up with a 1.28" head pipe diameter, 42" long @5000 RPM or a 1.52" dia 29.2" length @7500 RPM. (Since the calculator is for designing headers, I had to multiply 30 CID of one cylinder by 8 to get a meaningful result - ( www.wallaceracing.com/header_length.php ). Which confirms your impression that a 1.75" head pipe works better at racing RPM, and my sense that a smaller diameter pipe will be best for ordinary use. However, according to those who sell them, use of a torque cone (restrictor) between the head and 1.75" head pipe offsets the loss of low end power, hopefully without giving up much at the top end. No dyno sheets from the torque cone guys either. (This hobby sure takes a lot of faith to keep it going.) I wonder if CafeRacerCarl has any thoughts on this? Nah, it's spring time in OZ, those dudes are riding their hearts out while we shiver in the States. Bill |
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) willling to let Jon develop a system for the non-racing SR owner? Don't expect any reward for your service, beyond the satisfaction of having contributed to the well being of other SR owners (and of course if you want to buy the prototype, being the first in your neighborhood to have one).
