Texas Two Step Taco

Ring gap was plus .014”
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Our Squish with a stock Bultaco base gasket is .0245” we are shooting for .050-052”.
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We are going to enlist my wife and her scrapbooking cutter to see if she can make a gasket so we can do some testing then we will get Lani at Copper Gaskets USA to make us one.


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ran into another little problem as the reed is not fitting the reed box...however somebody had a stash of spacers
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BB let me borrow an H2 lockout clutch and Zeke has agreed in the spirit of competition to help design one in Fusion 360
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Highlights... two Texans and a two stroke. The two stroke is one of the most fascinating machines ever constructed.


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Nice big transfers in those cases - presumably to match the set of 4 transfers in an AJR barrel. That should move more air compared to stock and maybe as much as your reed barrels. ;)

Their website says it has 7 transfer ports. I can see 2 pairs on each side as normal, plus a channel port up the inlet. Where do they fit the other pair?
 
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teazer said:
Nice big transfers in those cases - presumably to match the set of 4 transfers in an AJR barrel. That should move more air compared to stock and maybe as much as your reed barrels. ;)

Their website says it has 7 transfer ports. I can see 2 pairs on each side as normal, plus a channel port up the inlet. Where do they fit the other pair?
Click to expand...

That is a good question! Can you imagine that with reeds? Told my wife I wanted to take her to Spain :)


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Just order one. Only about 1,000 Euros. It's only money, and probably less than the cost of two airfares plus hotels etc. Not as much fun as a long weekend in Spain perhaps but think of the years of memories an AJR cylinder could bring you....

All joking aside, it would be interesting to see a port map of the AJR motor compared to yours. Extra transfers are a bonus on AJR but maybe with a fat pipe you can generate enough of a negative pressure wave to pull a similar amount of gas in. Plus you have those boost ports above the intakes that should even things up a lot.
 
We checked the exhaust timing and it is 200 and the transfer duration is 143. Another subtle trick on how to check the duration by Bill Baxter.



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We made another base gasket and got the squish to .045. Maybe a little tight.

Third times a charm hopefully. We had several leaks. First we had to dissemble the reed box and clean and reapply sealants. We tried not using a gasket on the exhaust port and the sealant blew. Then there were small flakes of aluminum on the crank seals. We are about to button up add fluids but can’t get anybody who is willing to be the first one to kick it over.
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That's a lot of duration for a long stroke motor, but BB and DF know what works.
 
teazer said:
That's a lot of duration for a long stroke motor, but BB and DF know what works.
Click to expand...

Bill was very surprised and said that the transfers should be below 140.


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With reeds, the intake timing is less critical, but not as irrelevant as people might thing.
 
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