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High Performance Bicycle Engine Tips and Motorized Race Bicycles We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds

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  #11  
Old 01-24-2016, 11:54 AM
brywink04 brywink04 is offline
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Location: new york
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Default Re: building my motor up-need help

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Originally Posted by 2door View Post
The OP hasn't said how many miles he has on the engine but it sounds like not many.
All too often I see a new builder asking how to make his engine run better and wanting to make modifications and add go-fast parts when his engine isn't close to be broken in.

Before I'll suggest changes I'll tell him to put two to three hundred miles on a stock engine before worrying about top performance. The little Chinese 2 strokes are like a good wine. They need to 'mature' before they are ready to be enjoyed

Tom
yes i understand. my bike currently has 61 miles toltal on it. i put this carb on it because of the vacuum leak problem the old carb had. also when i bought this carn and boost bottle kit i was under the impression that i needed the better pipe. this is my third kit ive built in the last year (they help pay to build this on) but this is the first one i have tried modifying.



heres a picture of my bike (when it wasnt finshed) https://scontent-lga3-1.xx.fbcdn.net...3f&oe=5700436D
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  #12  
Old 01-24-2016, 02:04 PM
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Venice Motor Bikes Venice Motor Bikes is offline
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Default Re: building my motor up-need help

16:1 ratio is way too much oil!!!

Try using 24:1 for a couple of gallons, then switch to 32:1.
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Last edited by Venice Motor Bikes; 01-24-2016 at 02:10 PM.
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  #13  
Old 01-24-2016, 05:29 PM
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sbest sbest is offline
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Join Date: Nov 2015
Location: Nova Scotia
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Default Re: building my motor up-need help



Sweet bike!
Put the pipe and carb on once you get it broke in and running right.
Install one thing at a time and make it work before moving on.
See if it is an improvement or a detriment.

I've gotta agree with all posters.
It took 3 tanks of fuel to get anywhere near broken in.
You could see it in the rings still having black areas on their face.

Also, I would recommend the AmsOil Interceptor and especially the Dominator 2 stoke oil but not so much their other stuff. The Dominator oil is very good stuff when I tested in my KTM, not so much the Inerceptor, and the other stuff was cheap junk. I base this on ring sealing ability. My KTM 125 EXC is very sensitive to oil quality and makes a good test bed. I am leaning more to 32;1 being the perfect ratio in the China Girl engines but until I get a new cylinder on I won't know for sure. 16:1 or even 20:1 are likely too much oil.

Hey, a pipe change is 38 seconds. Timed myself last night. Just for fun.
Less than 5 minutes to remove intake, exhaust, and cylinder.
You will never get an easier engine to work on.

Steve

Last edited by sbest; 01-24-2016 at 05:33 PM.
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  #14  
Old 01-24-2016, 09:37 PM
brywink04 brywink04 is offline
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Join Date: Jan 2016
Location: new york
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Default Re: building my motor up-need help

Quote:
Originally Posted by sbest View Post


Sweet bike!
Put the pipe and carb on once you get it broke in and running right.
Install one thing at a time and make it work before moving on.
See if it is an improvement or a detriment.

I've gotta agree with all posters.
It took 3 tanks of fuel to get anywhere near broken in.
You could see it in the rings still having black areas on their face.

Also, I would recommend the AmsOil Interceptor and especially the Dominator 2 stoke oil but not so much their other stuff. The Dominator oil is very good stuff when I tested in my KTM, not so much the Inerceptor, and the other stuff was cheap junk. I base this on ring sealing ability. My KTM 125 EXC is very sensitive to oil quality and makes a good test bed. I am leaning more to 32;1 being the perfect ratio in the China Girl engines but until I get a new cylinder on I won't know for sure. 16:1 or even 20:1 are likely too much oil.

Hey, a pipe change is 38 seconds. Timed myself last night. Just for fun.
Less than 5 minutes to remove intake, exhaust, and cylinder.
You will never get an easier engine to work on.

Steve
yeah i like teh dominator. my ktm runs off 50-1 on dominator. bike runs like complete crap off cheap oils. and cheeap fuels. and again. i cant run my stock carb. it doest seal correctly and and the motor has a bad vacuum leak. i will though take the pipe off and run the stock pipe for another couple tanks. ive got a little over 61 milesand have burned about a third of a tank threw it.
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  #15  
Old 01-24-2016, 11:00 PM
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sbest sbest is offline
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Join Date: Nov 2015
Location: Nova Scotia
Posts: 286
Default Re: building my motor up-need help

What have you got for KTMs?
I've got a street legal 2000 125 EXC

20 litre gas capacity, 140kph top speed and lotsa range.

A 2003 300 EXC

Ignore the SX seat, this is the same bike. Note the ice screw in the tires. This bike is light.


And a 2003 KTM 250SX powered Yamaha Blaster that weights only 300 lbs.


As well as a 2003 KTM 380 SX and a deceased Husaberg 450:

61 miles! Get on that thing and RIDE! I did more than that today in the cold frozen North up here.

Steve
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  #16  
Old 01-25-2016, 07:45 AM
brywink04 brywink04 is offline
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Default Re: building my motor up-need help

Nice! I have a ktm 85sx it's a 2015 set up for woods. I need something bigger though.
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  #17  
Old 01-25-2016, 11:51 AM
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leo leo is offline
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Location: southern wv
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Default Re: building my motor up-need help

you could just get an o-ring.

http://www.ebay.com/itm/151734025556...%3AMEBIDX%3AIT
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It will be "done" when it can climb trees, go 300 mph, and fire lasers from the headlights. Surface to air missiles would be nice too.
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  #18  
Old 01-25-2016, 12:57 PM
brywink04 brywink04 is offline
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Default Re: building my motor up-need help

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Originally Posted by leo View Post
I send a picture of how it seals later. The slots under the clamp don't get fully covered. I'd have to find a way to fill those holes up
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  #19  
Old 01-25-2016, 02:15 PM
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leo leo is offline
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Default Re: building my motor up-need help

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Originally Posted by brywink04 View Post
I send a picture of how it seals later. The slots under the clamp don't get fully covered. I'd have to find a way to fill those holes up
you could cut a small piece of soda can and put it under the screw clamp.

as you can see from the pic, i had the exact same problem. i cut my intake a little too short trying to save some space.
later, i got a new intake and put on a nt speed carb.
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It will be "done" when it can climb trees, go 300 mph, and fire lasers from the headlights. Surface to air missiles would be nice too.

Last edited by leo; 01-25-2016 at 02:29 PM.
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  #20  
Old 01-25-2016, 02:19 PM
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leo leo is offline
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Default Re: building my motor up-need help

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Originally Posted by leo View Post
you could cut a small piece of soda can and put it under the screw clamp.
yes, it was a beer can. :-)
Bush, i do believe...
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It will be "done" when it can climb trees, go 300 mph, and fire lasers from the headlights. Surface to air missiles would be nice too.
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