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  #11  
Old 02-14-2006, 01:58 PM
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Default Re: More HP for 2000 KX60?

     

Thanks for the input--I think I'll try the VForce3 first.
The KX80/85 carb might reduce the amount of controllible hp from mid-rpm up so I'll stick with what I have.
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  #12  
Old 02-14-2006, 02:59 PM
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Default Re: More HP for 2000 KX60?

really want more power? lots of people can port it. you can do a pretty decent job by the following. for top end start by drilling a 0" hole in the back of the piston right under the ring land below lined up with the ring keeper pin. boring the cylinder 2mm or so over is another good move that should coincide with some porting changes. It is best to make them (the porting changes) after it is bored but before the plating is done. Set the exaust port to be .000 from the top of the cylinder. they should be 00 to 000mm wide at the widest parts(measured on the arc of the bore). Transfers 000 from the top.
You can make case boost ports by laying the cylinder face down on the bench and taking a file and cutting a channel 00 deep and a little wider (remember to use a rat tail file) from the transfer port bases to that boost port in the back of the cylinder.
We did the drilling of the piston years ago before seeing another cylinder that was done elsewhere. To be honest the biggest difference came from the hole drilled in the piston, but all gave better top end. Seemed just as reliable.
Now you say you have a custom pipe already. The bigger carb that FFR suggested is probably the best thing you can do since you already have the pipe. The 00 mm that used to come on the 80 fit rignt into the stock boot. Hopefully it (the pipe) is compatible with the rest. You get some better top end manners with a stiffer reed such as carbon tech's high rpm reeds. Havent been in a 60 in 12 years, we used the stock reed block. I can't believe that you will get any big gains in hp with a different block. Haven't on any of the 250's or 125's we have put them on. What we seem to get is some increase in response and usually a builtin hit that we usually didnt want.
On a quarter mile ice oval the two 60's we played with would run with a sloppy running 80 of any brand and go by many of them.
if it seems down on compression you can mill the head, but depending on what fuel you run, I would try it stock at first.

Last edited by ossagp1; 02-18-2006 at 11:02 AM.
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  #13  
Old 02-14-2006, 07:15 PM
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Default Re: More HP for 2000 KX60?

Quote:
Originally Posted by ossagp1
really want more power? lots of people can port it. you can do a pretty decent job by the following. for top end start by drilling a 7/32" hole in the back of the piston right under the ring land below lined up with the ring keeper pin. boring the cylinder 2mm or so over is another good move that should coincide with some porting changes. It is best to make them (the porting changes) after it is bored but before the plating is done. Set the exaust port to be .840 from the top of the cylinder. they should be 21 to 21.1mm wide at the widest parts(measured on the arc of the bore). Transfers 1.260 from the top.
You can make case boost ports by laying the cylinder face down on the bench and taking a file and cutting a channel 3-4mm deep and a little wider (remember to use a rat tail file) from the transfer port bases to that boost port in the back of the cylinder.
We did the drilling of the piston years ago before seeing another cylinder that was done elsewhere. To be honest the biggest difference came from the hole drilled in the piston, but all gave better top end. Seemed just as reliable.
Now you say you have a custom pipe already. The bigger carb that FFR suggested is probably the best thing you can do since you already have the pipe. The 28mm that used to come on the 80 fit rignt into the stock boot. Hopefully it (the pipe) is compatible with the rest. You get some better top end manners with a stiffer reed such as carbon tech's high rpm reeds. Havent been in a 60 in 12 years, we used the stock reed block. I can't believe that you will get any big gains in hp with a different block. Haven't on any of the 250's or 125's we have put them on. What we seem to get is some increase in response and usually a builtin hit that we usually didnt want.
On a quarter mile ice oval the two 60's we played with would run with a sloppy running 80 of any brand and go by many of them.
if it seems down on compression you can mill the head, but depending on what fuel you run, I would try it stock at first.
Damn, your good, Andy!!
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  #14  
Old 02-15-2006, 07:14 PM
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Default Re: More HP for 2000 KX60?

Tryce, I am chuckling now that I reread the original poster's comment on the carburetor...LOL,,,sounds like someone different than the one who wrote the original post and what kind of power band they were looking for doesn't it?? Oh well,,bolt it on,,slap on the decals/lickemstickems and just FEEEEEEEL the power, eh? (Those electric drills can be oh so tricky, I am actually scared of them myself and send that kind of work "out"!)
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  #15  
Old 02-15-2006, 08:18 PM
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Default Re: More HP for 2000 KX60?

I noticed that too Andy, but I didnt say anything. Do we want top end or dont we??? That is the question. Tdub
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  #16  
Old 02-16-2006, 01:55 AM
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Default Re: More HP for 2000 KX60?

I kind of figured if a 9 year old could ride it with the 28 on it and some porting that,,,,anyway lol,,,the question still remains. ;-)
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  #17  
Old 02-16-2006, 01:21 PM
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Default Re: More HP for 2000 KX60?

Yeah, I'm not sure what I was thinking
I was thinking about just the top end first and that the slicks have all the hook-up in the world and then I rethought it because perhaps I'm not seeing the whole picture here.
In the big bike world it seems as though everyone is moving towards an easier riding, more torque and more hp "under the curve" of the entire rev range rather than all-out hp.
Then I thought about slicks vs. dirt and the different requirements there.
So now I just am not too sure--but I think now rideability is more important than hp.
So I guess I now have the opposite question--how to get more rideability without sacrificing top end.
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  #18  
Old 02-16-2006, 07:58 PM
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Default Re: More HP for 2000 KX60?

I don't think you can use the word "rideability" and KX60 in the same sentence! Go for the HP and hang on Tdub
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  #19  
Old 02-17-2006, 12:30 PM
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Default Re: More HP for 2000 KX60?

if you need more rideability on a 60cc mx engined based roadracer i would suggest a different hobby or pedals from a schwinn in addition to the engine.

seriously, that is a class where you shouldnt need low end if you are competitive.
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  #20  
Old 02-18-2006, 06:23 AM
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Default Re: More HP for 2000 KX60?

When I earned the #1 plate I must have forgotten to attach my Schwinn pedals in the correct place.
You might know how to tune for the dirt, but the requirements for roadracing are probably more different than I originally expected. Try playing on paved roads if you're up to it I'll even show you where the pedals go if you ask nicely.
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