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Discussion Starter #1
Lots of folks always asking how to perform a Solder Squish Test (SQT), instead of posting simple links to general squish tests that are not particular to the Honda ATCTRX250R, here are some pictures showing the exact process for a 250R.

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Rosin core solder in 1/16" diameter, cut a 12" length, bent in a 'U' shape to 6", Braid tight as shown in picture 4 from Left. Snip both ends flat and perpendicular to length. Take the bore diameter and divide by 2, bend two 'L' ends as shown in picture 5, this sample is for a 76 MM, the legs measure 1.5" or half the 76 MM bore. Keep both 'L' shapes on the same plane as shown in picture 5 from Left.

This is the first part, second part to follow in post #2...

Carlos
 

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Discussion Starter #2 (Edited)
Part #2....

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From picture on the Left, place solder through spark plug hole, keep solder leg going Left to Right or Right to Left for orientation puposes. It is important to keep the solder leg over the Wrist pin, and not from the exhaust to intake. Keeping it over the Wristpin prevents the piston from rocking and giving you a false reading.

Picture #2 shows solder in the Dome area all the way to the outside of the Dome. Picture #3 shows solder up against cylinder outside bore, on the wall and resting on the Dome. Hold solder in this position and work piston up through its stroke to squash solder.

Remove solder and measure at its tip, the farthest point that contacted the cylinder wall. Use a Micrometer or Calipers to measure squashed thickness. Picture #6 shows how the 'squshed' solder tip looks.

The measured thickness is your squish clearance using the SQT method. Picture #4 shows a .039" thick squashed solder tip.

Carlos
 

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Discussion Starter #7
Great visual !
X2...I hope it helps folks out; thanks Dave...!

whats the marks on the cylinder head the hash marks Carlos
This is known a 'Turbo Head'...a mod that was done back in the day by a certain builder. FYI...It does not work, you won't see that head or "hash marks" on any BDT built engine. I just pulled a head out of a 'scrap' pile for illustration purposes only. In my book; it is nothing more than 'snake oil' sales tactics...:)

Carlos
 

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I watched Carlos do this in person it was very impressive and effective and its not rocket science. A must for all modified 2 strokers
 

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Very good technique. I always used the clay method, but you need to remove the head, and is not as precise as the solder method. Thanks for sharing.
 

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Years ago, another builder gave me some stuff looked like solder, but was much softer than the rosin core solder. He called it soft metal & I never found out where he got it from.
I've asked several supply places, nut & bolt, plumbing & electrical supply, but nobody knew anything about it. Even asked the guy I got it from & he cant remember.
It was much softer than the solder, so would be easier to squish once in place. Trouble is finding some more of that same stuff.

The roll of solder for the squish test, is something every 2 stroke owner should have included in their tool box, along with an old push mower engine starter handle & rope for installing & removing pipe springs, a pressure tester & no less that one tube of Three Bond #1211 sealant.
:) Neil
 
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