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General Minitrail Talk
Modifications
Tuning CT70s for street use
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<blockquote data-quote="fatcaaat" data-source="post: 57795" data-attributes="member: 1656"><p>A properly tuned 88cc kit, and properly geared, should take your bike out to about 55-60mph. The last 88 kit I did was in a Sachs Madass, which weighed in at 190lbs and I also weigh 190lbs and the 88kit took that to 53mph on the flat. I also realize that you purchased a complete kit...I'm curious to know if you got the right piston. The pistons for the modern motors have different deck heights than the pistons for the older motors. If you assembled the motor and the piston was for the modern bike, you are leaving the piston about 3mm in the hole at TDC, thus significantly reducing your compression ratio, and thus, power. When you assembled it, did the piston come all the way to TDC level with the top of the cylinder deck? </p><p></p><p>The kit is designed to be run with a fairly open exhaust. You should be able to mount the piston kit and head and carb and not need to rejet it. I've built a few of these in my time and never once had to rejet one. As a matter of fact, I have one in a box sitting here that's going to be installed this weekend on a bike. </p><p></p><p>If you purchased the correct piston and head combo, it should run well as jetted. If you need more power than that, its available in the form of a stroker crank. since you're running still the 6v stuff, you can go to dratv and buy one of the 52mm stroker cranks and make a 52 x 52 square bore 110 motor. That will get you into the mid-upper 60s. <a href="http://www.dratv.com/racr52stforp.html" target="_blank">http://www.dratv.com/racr52stforp.html</a> is the correct one for your application. And no matter how you slice it, you'll need to update your oil pump and shaft so that the crank ways will clear.</p></blockquote><p></p>
[QUOTE="fatcaaat, post: 57795, member: 1656"] A properly tuned 88cc kit, and properly geared, should take your bike out to about 55-60mph. The last 88 kit I did was in a Sachs Madass, which weighed in at 190lbs and I also weigh 190lbs and the 88kit took that to 53mph on the flat. I also realize that you purchased a complete kit...I'm curious to know if you got the right piston. The pistons for the modern motors have different deck heights than the pistons for the older motors. If you assembled the motor and the piston was for the modern bike, you are leaving the piston about 3mm in the hole at TDC, thus significantly reducing your compression ratio, and thus, power. When you assembled it, did the piston come all the way to TDC level with the top of the cylinder deck? The kit is designed to be run with a fairly open exhaust. You should be able to mount the piston kit and head and carb and not need to rejet it. I've built a few of these in my time and never once had to rejet one. As a matter of fact, I have one in a box sitting here that's going to be installed this weekend on a bike. If you purchased the correct piston and head combo, it should run well as jetted. If you need more power than that, its available in the form of a stroker crank. since you're running still the 6v stuff, you can go to dratv and buy one of the 52mm stroker cranks and make a 52 x 52 square bore 110 motor. That will get you into the mid-upper 60s. [url]http://www.dratv.com/racr52stforp.html[/url] is the correct one for your application. And no matter how you slice it, you'll need to update your oil pump and shaft so that the crank ways will clear. [/QUOTE]
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