Has anyone used one of these tools?
http://www.yamaha-racingparts.com/model.php?cat=0&sub=0&page=5&product=274
http://www.yamaha-racingparts.com/model.php?cat=0&sub=0&page=5&product=274
Squish Tool- Yamaha Racing
- Thread starter Moto7man
- Start date
StuJohnson
New member
I have not seen one like that.
But recently came across this company that makes cylinder heads for GasGas.
http://www.vhm.nl/?navi=cylinderheadmeasuringtools
Have any of you out there seen or used the brand?
http://www.vhm.nl/?navi=cylinderheads
But recently came across this company that makes cylinder heads for GasGas.
http://www.vhm.nl/?navi=cylinderheadmeasuringtools
Have any of you out there seen or used the brand?
http://www.vhm.nl/?navi=cylinderheads
pscook
Platinum Level Site Supporter
Think road racing tools. Used to determine piston crown height from top of deck. Zero the indicator on an index plate, clamp to top of cylinder, roll piston through the stroke. The cylinder to head interface is different on those bikes than the GG. No recessed head, IIRC. Once you know your piston height, you can set your squish or volume based on head selection. I raced with folks who had unleaded heads, 50/50 heads, and race heads. You measured the piston, measured atmospheric stuff, got specific gravity of a known fuel, measured the fuel/oil ratio by weight, jetted to perfection, then squeak a piston on the first practice lap. 
Then back to the pits, and start over again.
260 Euro for a cylinder head kit, pretty cool. But you have to buy the inserts (40 Euro), the squish tool (didn't look), then a couple of seal kits (don't want to have to wait for shipping on consumables).
Then back to the pits, and start over again.
260 Euro for a cylinder head kit, pretty cool. But you have to buy the inserts (40 Euro), the squish tool (didn't look), then a couple of seal kits (don't want to have to wait for shipping on consumables).
There is some nice stuff on that page....
StuJohnson
New member
That is good to know. I never had heard of them. Very pricey stuff though.
Seems to be somewhat similar to the S3 like you have on your bike....?
Jakobi
Super Moderator
Yeah similar design.. The real magic is in the design of the squish band, the clearances, and the volume of the combustion chamber.
I wouldn't recommend the S3 to anyone, as imo the design is pretty poor. The volumes are the same between the inserts and the various compression inserts just change the depth (or squish height). Ideally you'd want a fixed squish height thats in the ballpark, and then different volumes to set the compression ratio.
I wouldn't recommend the S3 to anyone, as imo the design is pretty poor. The volumes are the same between the inserts and the various compression inserts just change the depth (or squish height). Ideally you'd want a fixed squish height thats in the ballpark, and then different volumes to set the compression ratio.
StuJohnson
New member
Good to know about the S3.
So it is just mire bling then an actual enhancement in performance...!!!??
So it is just mire bling then an actual enhancement in performance...!!!??
Jakobi
Super Moderator
Pretty much.. Looks good and still offers some benefits of the interchangable head if you were a serious racer and had varying custom inserts made up. Then again it would be just as easy to have a couple stock heads too.
They do look nice though
I have a red one and a gold one to choose from. Haha!
They do look nice though
I have a red one and a gold one to choose from. Haha!Pretty much.. Looks good and still offers some benefits of the interchangable head if you were a serious racer and had varying custom inserts made up. Then again it would be just as easy to have a couple stock heads too.
They do look nice though
Thats "double bling!" LOL.
(F5)
Gold Level Site Supporter
I think in roadrace, but still think a bit of solder in a few places is a better tool for seeing what is really going on when torqued up.Think road racing tools. Used to determine piston crown height from top of deck. Zero the indicator on an index plate, clamp to top of cylinder, roll piston through the stroke. The cylinder to head interface is different on those bikes than the GG. No recessed head, IIRC. Once you know your piston height, you can set your squish or volume based on head selection. I raced with folks who had unleaded heads, 50/50 heads, and race heads. You measured the piston, measured atmospheric stuff, got specific gravity of a known fuel, measured the fuel/oil ratio by weight, jetted to perfection, then squeak a piston on the first practice lap.
Then back to the pits, and start over again.
. . .
If I ever get my RR bike stable I'll finally get around to skimming my 300 head which I've been meaning to since I bought it. I've measured the squish & compression ratio, I want to close squish up but alter volume to keep compression the same as now so I can kickstart the thing as easily as present which at 5'8" is a serious consideration
pscook
Platinum Level Site Supporter
I think in roadrace, but still think a bit of solder in a few places is a better tool for seeing what is really going on when torqued up.
If I ever get my RR bike stable I'll finally get around to skimming my 300 head which I've been meaning to since I bought it. I've measured the squish & compression ratio, I want to close squish up but alter volume to keep compression the same as now so I can kickstart the thing as easily as present which at 5'8" is a serious consideration
I believe the "squish tool" should be used more for ignition timing, to determine physical TDC as opposed to "timing mark" TDC, or even degree wheel off a stopper. But, you are right that solder is a much better tool to determine squish in specific areas, especially with a domed piston.
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