RIDICULOUS squish. as always!

[stainlesscycle]

well, got around to checking squish on my 07 300 - i knew it was loose, i could see at least 3 gaskets on the base. i measured it and my thickest solder (.125") doesn't even squish. that's more than 3mm. why does gasgas set these up with such a giant squish? i've gotta pull the cylinder to see how many gaskets i can remove and still not kill the port timing.

[Brian VT]

Assuming the exhaust port timing can take it...what squish will you shoot for ?
Something at, or just above, .020" ? That's what I've done on some chainsaws. Often no base gasket to get there. Just Yamabond 4.

[stainlesscycle]

i shoot for anywhere in between 1.2mm and 1.6mm. i have learned that 1.2mm needs at least 50% 112 octane. i don't think i can even achieve 1.5mm on this one. still scraping old gasket to measure it try to figure out what gaskets they had and do a little math. if my squish is still obnoxious i'll send it out to rb after november....

[stainlesscycle]

at least 3 gaskets. green/grey/green = 1.1mm of gaskets. mic'ing the gaskets at several points gets me about 1.15 mm. if i run just 1 thin one (.15mm gasket) i will end up in the 1.95mm range. better than 3mm, but still not great. what will port raising of 1mm get me? i'm assuming i'll lose some top end. how much i don't know....



i have to run at least 1 gasket. it's hard to get a good seal with the .15mm gasket, but i've been sucesful in the past.... just running yamabond only is too risky...

[stainlesscycle]

reviewing this thread : http://www.dirtbikeworld.net/forum/s...ad.php?t=82850

shows 1mm port drop just kills top end (green line). so i guess i'll throw a .3 gasket in there and try to get best of both worlds until i can get head machined.

[stainlesscycle]

good thing about tearing into it - i got to reshape/recontour the pv so it opens all the way.. that might give me some zing.

[Jakobi]

Thats HUUGE!!

[gasgasman]

It worked well for 5 years, no?

[stainlesscycle]

yes, it worked fine. but there's always better. there are some plusses to having a big squish.. but i'd like to unlock some hp...

[Bailey28]

Stainless, as you may remember, I redid the base gaskets a few weeks ago. I had the two green gaskets, 2.5+mm of squish. I used only one dark green gasket to reassemble, resulting in the 1.67mm of squish, or .066"

My bike runs soooo much better, more snap, pull, better cleaner running, wheelie power is fantastic!