Maintenance & Technical > KX500 Original
I want more over rev
gowen:
--- Quote from: doordie on December 21, 2006, 05:55:24 AM ---jigggawatt,easiest way is to lower the advance of ignition.
Take away flywheel and move ignitionplate counterclockwise to the last mark.
Raise cylinder makes more rpm and you get higher portimes and lose some bottom.
You have to shave head to avoid "pinging" when you do this.
1,5-1,7mm is safe squish(head to piston at edge).
Use search and type squish... :wink:
--- End quote ---
I agree with Retarding the ignition. But, I noticed it made my ignition flat, though it did over'rev it just felt like a flat over'rev. Try it out though.
Polar-Bus:
--- Quote from: jigggawatt on December 21, 2006, 01:25:05 AM ---I have a low hour 01 500 . I have a fmf gnarly pipe, reed spacer, procircuit 296 silencer. jetting is 168 main and 55 pilot. The bike starts , idles and runs well. I would like more rev. It signs offf pretty early and goes flat. I was thinking of a thicker head gasket . What do you think? I'm not new to 500's , but I've always had red ones. I rode a honda 500 in the Glen Helen 24 hour. I wish now it would've been a green bike , so much easier to ride. Do you think a thicker head gasket is what I'm looking for ?
Thanks,Jim
--- End quote ---
A old skool method for adding revs up on top is to double up on the cylinder base gasket, and run a thinner head gasket. Another trick is to run a flywheel weight which adds max RPM's. A flywheel weight doesn't technically add additional rpm's but allows the engine to rev higher because the added weight has created added rotational crankshaft inertia. I have a Steahly 14 oz. weight and I have a sweet over-rev with no noticable sign-off on rpm's.
kx666:
--- Quote from: Polar-Bus on December 22, 2006, 09:58:00 AM ---
--- Quote from: jigggawatt on December 21, 2006, 01:25:05 AM ---I have a low hour 01 500 . I have a fmf gnarly pipe, reed spacer, procircuit 296 silencer. jetting is 168 main and 55 pilot. The bike starts , idles and runs well. I would like more rev. It signs offf pretty early and goes flat. I was thinking of a thicker head gasket . What do you think? I'm not new to 500's , but I've always had red ones. I rode a honda 500 in the Glen Helen 24 hour. I wish now it would've been a green bike , so much easier to ride. Do you think a thicker head gasket is what I'm looking for ?
Thanks,Jim
--- End quote ---
A old skool method for adding revs up on top is to double up on the cylinder base gasket, and run a thinner head gasket. Another trick is to run a flywheel weight which adds max RPM's. A flywheel weight doesn't technically add additional rpm's but allows the engine to rev higher because the added weight has created added rotational crankshaft inertia. I have a Steahly 14 oz. weight and I have a sweet over-rev with no noticable sign-off on rpm's.
--- End quote ---
correct me if I am wrong, but I have always tried to keep the rotating assembly as light as possible when building for horsepower, allowing the motor to be more responsive and quicker. Adding weight to the rotating assembly usually adds a lot of torque at the expense of top end power.
gowen:
--- Quote from: kx666 on December 30, 2006, 02:16:57 AM ---correct me if I am wrong, but I have always tried to keep the rotating assembly as light as possible when building for horsepower, allowing the motor to be more responsive and quicker. Adding weight to the rotating assembly usually adds a lot of torque at the expense of top end power.
--- End quote ---
That would be correct, it adds enertia to the low spinning flywheel keeping it moving with little efford (torque) but can't quite spin up due to the weight.. Lame terms, but all the same.
I've never ever kept a flywheel weight. Don't like them. I'm always on the pipe no matter where I ride.
Polar-Bus:
You light flywheel guys are a stubborn breed :) Everyone has different needs. I don't have a lot of experience in deep sand, so I won't further comment, but here in New England, and out on the MX track, flywheel weights offer FAR more pro's than con's.
http://www.steahlyoffroad.com/about_steahly.shtml
And heres a bit more input (although this rider speaks from on road racing opinions):
http://www.ducati.net/faq.cfm?id=44
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