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Echo 3 cube struggle bus

Red97

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Working on my 2nd, well first "pro" build racer. First was a 50cc clammy echo.

So, started with and idea, and a few parts piles and some awesome ideas from many saw builders.

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Decided this cs5000 will make a nice platform to build from

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going to try a stroker build.
Modding a 36mm crank to fit in place of the stock crank.

Nice thing about having lots of parts and pieces is I can use the smaller diameter clutch threads, bearing and drum to be able to use the longer stroke Crank.

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Heated and pressed on a collar for the seal area and the worm stop.

This crank was my first time doing any thread operations on the lathe.

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Fresh off the od grinder.
 

Red97

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Bored the case to fit the crank, did need to turn the crank od some and grind the sides of the rod a tad.

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New bearings Installed and crank centered up.

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Cut the first cylinder too short. (This orange case was my mock up case)
 

Red97

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20230420_123557.jpg
Round 2 was a bit better.
Making an intake block

42mm bore 030/031 cylinder

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Broke my top block support fin off had to get creative.

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Put the blocl on a diet the. Welded some sleeves through the top holes, bolted and jb weld the block on.
 

Red97

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20230424_154045.jpg
Fwe more hurdles to go, but it is starting to look like something.

Pushing the limits of useable plating.
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Even the intake is about maxed out.

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But that is all part of the fun.
 

Red97

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o ring fitted to the head.
20230426_154754.jpg

Had to make a bushing to fit the oil worm and press that all on the crank with some green loctite.

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Had to make a spacer to fill the counterbore, needed more sealing surface, the cylinder is a bit too narrow without it
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Starting to come together. Hope to test cut tomorrow.....

 

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Here she be. I'll upload the test cut video here in a bit.
 

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smokey7

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Looks once it had the revs built up and you dropped it in Wood it kept them but if you dropped it in wood at a lower RPM it never made it up to the high RPM
 
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