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Discussion Starter · #1 ·
Well I finally finished up my sons XR70 in time for the spring race series at Durhamtown thought i would share some pictures with every one of it in its various stages of development.

The first picture is the stock XR70 as it looked before doing anything to it at all.

http://i333.photobucket.com/albums/m391/gajonn/xr70_09.jpg

The next one is with the BBR SP5 damping rods installed

http://i333.photobucket.com/albums/m391/gajonn/xr70_11.jpg

This one is with the+4 china swing arm and shock installed

http://i333.photobucket.com/albums/m391/gajonn/xr70_13.jpg



After this Chris raced it once at Durham town in the small wheel 4 stroke class for bike 70cc thru 110cc He was doing pretty good till he hit the ground.

After that race we decided that the stock 70 motor with the improved suspension wasnt going to be enough. So later that fall I started looking around for a engine kit. After looking at several sellers I decided to go with a 107 stroker kit from Firepower354. I really feel I made a right choice there I must say. Terry has been 100% suportive with tech help after the sale. He quickly answered every question I emailed him, and believe me I emailed him quite a few. I would have been lost if If terry wasnt there to support this project after the sale. He has also been helpfull in answering questions that did not relate the the engine kit I bought. Thanks SO MUCH TERRY.

Here is the finished pictures of the project and a description 107 stroker kit with a race head and a 22m carb with a port matched intake and Uni filter. Staggs racing shock out back and modified BBR sp5 damping rods to better suit the weight of a 90 pound rider.

http://i333.photobucket.com/albums/m391/gajonn/finishedbike002.jpg



http://i333.photobucket.com/albums/m391/gajonn/finishedbike003.jpg



 

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I have that same swinger on my 70. Haven't really abused it a lot, but I have jumped it and trail ridden with it and it's holding up good. Once you make the right spacers for it, it fits nicely. I got mine off of Ebay also, ordered it without the shock and it showed up with the shock anyways. You could re-route that brake rod over the swinger and flip the brake arm 180* and have one less thing to worry about snagging on it. My bike even has the same number on it.
 

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Discussion Starter · #10 ·
Super Dave: yeah the motor rips for sure. I am weigh 155 and it pulls like crazy. I cant imagine what it must feel like to my 9 yr old son who weighs about 90 lbs in all his riding gear :D



NoDoze: Most trails you could prolly manage with motard tires unless it rained the night before. It gets pretty darn hard packed there. If not there is always the 1/4 mile flat track. I use it to blast out all of the spoo that has built up in my pipe and silencer after a day of trail riding my RM250 :rolleyes:.

Chris clocked a 29 second lap when I timed him and he didnt know he was on the clock.

The swing arm is holding up well, but understand. It is chris's race bike and he weighs 90 lbs. I have not jumped the bike my self or abused it.



JohnnyB : got the swing arm on ebay. You will most likely have to make a trip or two to the hardware store to make a spacer for the swing arm nut and bolt as mine was too long and not threaded long enough. Or.. you could say that on the out side the china swing arm is a bit narrower. If you buy it with out the shock I have the one that came with it that i dont need any more.



Underestimated: will you be racing in the pit bike class or the small wheel 4 stroke class?



Scar8 : thanks for the compliment, We kind of went with a sleeper look, at first glance all that jumpps out at you is the swing arm.
 
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