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Discussion Starter #1
Hey guys! Has anyone just done one mod at a time and recorded the results?? What is the best first mod, a couple best mods, etc. A complete overhaul, all mod engine? Thanks in advance!!
 

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Hey guys! Has anyone just done one mod at a time and recorded the results?? What is the best first mod, a couple best mods, etc. A complete overhaul, all mod engine? Thanks in advance!!

Ive done them just about every which way you can and even compared the results between a complete bone stock engine and the engine I was doing the mods on........


The first mods are lighten the clutch plus add HP springs,lighten the flywheel plus add a rocket key , mod the exhaust, mod the reedplate aswell as reedstopper,, do the HP sparkwire mod and do the pumper carb mod with V-stack and HP airfilter....

If you don't get the pumper carb setup you can mod the stock carb to 15mm's aqnd do the petcock mod then get a V-stack with hp airfilter

Those mods really add alot of power to the bottomend takeoff aswell as midrange punch..






Good Luck
 

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Discussion Starter #3
For the HP wire mod, what wires do you use and where do you get them? The pictures are awesome, they show a lot. I flip a lot of pocket bikes and would like to do the most free or really cheap mods possible. Everybody Wants More For Less and being able to do really cheap mods will definitely help sell them. And for lightning the clutch, do you have a sticky for that mod? Or maybe just some pictures. Thanks buddy
 

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Discussion Starter #4
And the exhaust mod you were just talking about pulling two in out of the J pipe and adding three or four in to the center chamber correct? I'm still looking for a local guy to do those cheap for me
 

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For the HP wire mod, what wires do you use and where do you get them? The pictures are awesome, they show a lot. I flip a lot of pocket bikes and would like to do the most free or really cheap mods possible. Everybody Wants More For Less and being able to do really cheap mods will definitely help sell them. And for lightning the clutch, do you have a sticky for that mod? Or maybe just some pictures. Thanks buddy
Theres no sticky as far as I can remember and I certainly ddnt make one....LOL

As far as the clutch you weigh all 3 arms then you crossdrill to weight match them then you put HP clutchsprings or you can re-use the springs you have.....


On this clutch below the two holes raises the rpm throwout by 800rpm's on tis clutch and with the springs the clutch grabbed at 3900 rpm's..Its not a total science due to the varying weights of the chinese made clutches but anything that grabs above stock is gonna give you some extra power on the takeoff....

I usually start with a 1/8" drillbit and the springs from the steel clutches.....

This engine is a 5 port so it has way more torque than a bone stock engine...



This one grabbed at like 31-3200..

 

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And the exhaust mod you were just talking about pulling two in out of the J pipe and adding three or four in to the center chamber correct? I'm still looking for a local guy to do those cheap for me
Yes you cut it in the center and add length to the expansion chamber...

Sometimes you find hidden surprises like this spark arrestor/catalystic converter type deal inside....


 

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And the exhaust mod you were just talking about pulling two in out of the J pipe and adding three or four in to the center chamber correct? I'm still looking for a local guy to do those cheap for me
If youre buying and flipping bikes and doing mods to enhance the resale value you should buy a cheap Harbor Freight rosin core mig welder and some muffler pipe.....

The welder comes in Handy for other things too and in the long run saves a bunch of cash n time............
 

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Discussion Starter #8
What spark plug wires are you using? Local auto parts store ones for a car? And I thought I remember somewhere along the line reading that most of them unscrew out of the coil but some don't.
 

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Discussion Starter #9
And I have a really crappy welder, wire fed one. My dad's got a nice rosin core I'm going to try to steal for a while
 

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What spark plug wires are you using? Local auto parts store ones for a car? And I thought I remember somewhere along the line reading that most of them unscrew out of the coil but some don't.
Ones from an automotive set that are High voltage high suppression..........7.7mm to 8.8mm can be useed but note that after 7mm.s you have to get creative and use some RTV and a splicing sleeve made from the rubber end of a straight plugboot....It will offer no advantages over the 7mm wire but it certainly looks cooler....LOL

The copper strand wire doesn't spark as intensely at high rpm's as the spiral core design...…...






 

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Discussion Starter #11
So for the HP wire, you are saying that 7 mm works great? Anything above that just looks cooler. But functions the same?
 

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At any decent auto parts store you can buy 7 or 8mm Accell wire by the foot off a big spool, and use an NGK cap.
 

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So for the HP wire, you are saying that 7 mm works great? Anything above that just looks cooler. But functions the same?

Pretty much as the coil can only generate so much power and the automotive type high voltage high suppression wire just enhances it....If the power of the coil was too much for the 7mm the 8.8 would obviously be an improvement..

The main thing to focus on is both out-perform the stock copper stranded wire that comes on them stock and also to also give the idea to the differences is an easy performance mod versus the extra mod-time to cool factor when it comes to fitting the fatter wire.........

 

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Discussion Starter #14
Hey guys, question, does anybody know the thickness of a stock clutch spring on these motors? I've seen or so it seems online that the HP race Springs are 1.5 mm thick. The stock clutch springs I have on a brand new clutch and a slightly used one are anywhere from 1.39 to 1.43. So 1.5 should be legit. But I'm curious if anybody knows the size differences. Thanks
 

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Hey guys, question, does anybody know the thickness of a stock clutch spring on these motors? I've seen or so it seems online that the HP race Springs are 1.5 mm thick. The stock clutch springs I have on a brand new clutch and a slightly used one are anywhere from 1.39 to 1.43. So 1.5 should be legit. But I'm curious if anybody knows the size differences. Thanks
The sizing sounds legit.....

To get higher stallspeed takeoff I use the springs from the steel clutches seeings the steel clutches I use need even stiffer springs to achieve the same rpm grab as the modded aluminum clutches...…….

 

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I got the NGK plug cap from pocketbikeparts .com, around $4. On my billet engine I used 9mm wire left from my Pro Stock drag bike.
 

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Discussion Starter #17
"I got the NGK plug cap from pocketbikeparts .com, around $4. On my billet engine I used 9mm wire left from my Pro Stock drag bike."

Very nice. Thanks for the lead. Looks very cool.
 

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Discussion Starter #18
Hey guys, question, does anybody know the thickness of a stock clutch spring on these motors? I've seen or so it seems online that the HP race Springs are 1.5 mm thick. The stock clutch springs I have on a brand new clutch and a slightly used one are anywhere from 1.39 to 1.43. So 1.5 should be legit. But I'm curious if anybody knows the size differences. Thanks
The sizing sounds legit.....

To get higher stallspeed takeoff I use the springs from the steel clutches seeings the steel clutches I use need even stiffer springs to achieve the same rpm grab as the modded aluminum clutches...…….

Hey cam2, out of curiosity, where do you get the steel clutches?
 

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Discussion Starter #19
Has anyone had luck modifying a stock air filter? One of my projects is a chinese minimotard and there is a bar right against the air filter. There is no way an adapter and UFO filter will fit. Unless I heavily modify that filter.
 
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