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Ok just got my rolling chassis now I need a motor, from what I have read the Cr80/85 seems to be the standard ticket, but what my questions deal with is squish, advance etc. I can set up a two stroke I have a couple of TZ250's but I don't have any expierence with the 80/85's. It seems that the only one runnning a Yam motor is Tyler, anyone set up a KX or KTM? The bike will probably be a endurance that I sprint on occasion as well.
thanks in advance!
Ok just got my rolling chassis now I need a motor, from what I have read the Cr80/85 seems to be the standard ticket, but what my questions deal with is squish, advance etc. I can set up a two stroke I have a couple of TZ250's but I don't have any expierence with the 80/85's. It seems that the only one runnning a Yam motor is Tyler, anyone set up a KX or KTM? The bike will probably be a endurance that I sprint on occasion as well.
thanks in advance!
Talk to Robert Blevins about the KTM thing...
I believe he is fitting one to a RS chassis for Connor.
FWIW... run something that you'll be able to get parts for at the track...
If you're the only one with it... then you're the only one with it... har har har...
Talk to Robert Blevins about the KTM thing...
I believe he is fitting one to a RS chassis for Connor.
FWIW... run something that you'll be able to get parts for at the track...
If you're the only one with it... then you're the only one with it... har har har...
No one runs the kawi motor because it is too rough. It broke frames and itself. From what I remember about Bryan Norton building his TZ/CR80, the honda motor fits into the yamaha chassis easily and the yamaha motor fits into the honda chassis easily. There is supposed to be someone in california that makes mounting kits for this purpose. Tom Hoover runs a suzuki rm motor. He says that it's down on power, but a solid runner. You may want to verify all this info from the related horses mouths.
Welcome to mini-smack.
No one runs the kawi motor because it is too rough. It broke frames and itself. From what I remember about Bryan Norton building his TZ/CR80, the honda motor fits into the yamaha chassis easily and the yamaha motor fits into the honda chassis easily. There is supposed to be someone in california that makes mounting kits for this purpose. Tom Hoover runs a suzuki rm motor. He says that it's down on power, but a solid runner. You may want to verify all this info from the related horses mouths.
Welcome to mini-smack.
Tom USED to run a RM, but the new(this year at least) bike has a CR80.
Tom USED to run a RM, but the new(this year at least) bike has a CR80.
I built one of these a few years ago and I used an 03 CR-80 motor. Send the motor Tommy Crawford in Ca and he will modify the kick start assembly so it will fit, provide all the engine mounting hardware and build a custom pipe & silencer, all for around $500. I installed the Keihin PWK 28mm carb and it ran like a champ. With Dustin Meador on board it would out run anything out there in the F4 class.
This is the easy and fast way to build a competitive RS-80. I do recommend upgrading the engine mountin bolts that Tommy sends or you will end up shearing one.
Troy
I built one of these a few years ago and I used an 03 CR-80 motor. Send the motor Tommy Crawford in Ca and he will modify the kick start assembly so it will fit, provide all the engine mounting hardware and build a custom pipe & silencer, all for around $500. I installed the Keihin PWK 28mm carb and it ran like a champ. With Dustin Meador on board it would out run anything out there in the F4 class.
This is the easy and fast way to build a competitive RS-80. I do recommend upgrading the engine mountin bolts that Tommy sends or you will end up shearing one.
Troy
I agree with Troy 100%. I have built two of these bikes and the CR-85 or 80 motor is the only way to go. Even then you have continual problems. If you try to be the lone ranger on the grid with a RM or KTM then when you break your done. When I got out of this class the majority 90% plus of the bikes were a RS chassis with a CR 80 version motor.
I agree with Troy 100%. I have built two of these bikes and the CR-85 or 80 motor is the only way to go. Even then you have continual problems. If you try to be the lone ranger on the grid with a RM or KTM then when you break your done. When I got out of this class the majority 90% plus of the bikes were a RS chassis with a CR 80 version motor.
Can Tommy Crawford provide mounts for an NSR50R chassis?
Can Tommy Crawford provide mounts for an NSR50R chassis?
Crawford for the mounts and pipe,
Mr. Weiss for the tuning, he has mundo CR80/85
experience and a gaggle of young flat trackers
as customers to prove it.
CR80/85, don't screw with any other motor, you will be the lone ranger and there is something to be said for riding as opposed to wrenching on race day....
[img]/ubbthreads/images/%%GRAEMLIN_URL%%/smile.gif[/img]
Crawford for the mounts and pipe,
Mr. Weiss for the tuning, he has mundo CR80/85
experience and a gaggle of young flat trackers
as customers to prove it.
CR80/85, don't screw with any other motor, you will be the lone ranger and there is something to be said for riding as opposed to wrenching on race day....
[img]/ubbthreads/images/%%GRAEMLIN_URL%%/smile.gif[/img]
Maybe I am missing something (VERY possible) but I think we are talking about a CR in a RS chassis.
If not then I retract the whole Crawford refernce....
[img]/ubbthreads/images/%%GRAEMLIN_URL%%/smile.gif[/img]
Maybe I am missing something (VERY possible) but I think we are talking about a CR in a RS chassis.
If not then I retract the whole Crawford refernce....
[img]/ubbthreads/images/%%GRAEMLIN_URL%%/smile.gif[/img]
Tommy Crawford can do either RS or TZ chassis, he has the jigs for both.
Machining on the motor is required for proper fit (at least on mine) and I recommend someone who has done it many times like Crawford.
Ditto on the mounting bolts. I've also broken one of the mounting brackets. On the CR/TZ the threaded a thin aluminum bracket for one of the mounting bolts to screw in to. That wasn't a great idea...Eventually we had to use a nut but the fit was really tight. For truly professional mount I would recommend boring a spot for a stainless steel thread insert on the bracket, but that's a lot of work.
The pipes on these things tend to break. It's really hard to get it right, but you can fab a bracket from the frame underneath the tail section to the stinger portion of the pipe, just make sure its rubber mounted to deal with all the vibration.
The Tommy Crawford pipe kept breaking so I had Jemco in Houston build one. Their first attempt shredded into pieces, but the second one was just right.
Tommy Crawford can do either RS or TZ chassis, he has the jigs for both.
Machining on the motor is required for proper fit (at least on mine) and I recommend someone who has done it many times like Crawford.
Ditto on the mounting bolts. I've also broken one of the mounting brackets. On the CR/TZ the threaded a thin aluminum bracket for one of the mounting bolts to screw in to. That wasn't a great idea...Eventually we had to use a nut but the fit was really tight. For truly professional mount I would recommend boring a spot for a stainless steel thread insert on the bracket, but that's a lot of work.
The pipes on these things tend to break. It's really hard to get it right, but you can fab a bracket from the frame underneath the tail section to the stinger portion of the pipe, just make sure its rubber mounted to deal with all the vibration.
The Tommy Crawford pipe kept breaking so I had Jemco in Houston build one. Their first attempt shredded into pieces, but the second one was just right.