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Post by Blu02Blaster02 on Jan 17, 2005 21:06:51 GMT -5
ok, lol go for it put it on there and run it. im sure it will run fine then  |
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Post by hnaoutlaw on Jan 17, 2005 21:27:18 GMT -5
how can you ge compression "way off"
you sound like you know squat about engines
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Post by Blu02Blaster02 on Jan 17, 2005 21:30:46 GMT -5
how can you ge compression "way off" you sound like you know squat about engines oh yeah? hmmm maybe you should figure out what your talking about befor you go around talking about someone else. cause the 240 piston is a 72mm piston and the 200 is a 66-68mm piston. Now look at the head...the chamber is about 68mm across..if you have a 72mm piston coming up to tdc it will hit the edge of the stock chamber on the the dome of the 72mm piston. When doing a 240 or 265 the head needs to be rechambered to a 72 or 77mm piston. |
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Post by Kshy.tk on Jan 17, 2005 21:35:34 GMT -5
oh yeah? hmmm maybe you should figure out what your talking about befor you go around talking about someone else. cause the 240 piston is a 72mm piston and the 200 is a 66-68mm piston. Now look at the head...the chamber is about 68mm across..if you have a 72mm piston coming up to tdc it will hit the edge of the stock chamber on the the dome of the 72mm piston. When doing a 240 or 265 the head needs to be rechambered to a 72 or 77mm piston. dude u seriously need to know what ur talkin about b4 u ask sum1!! lmao OWNED ;D |
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Post by Blu02Blaster02 on Jan 18, 2005 17:06:46 GMT -5
The guy who made this thread, did you get it figured out?
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Post by hnaoutlaw on Jan 18, 2005 17:58:00 GMT -5
the edge of the piston does not pertrude from the cylinder so how whould it hit the edge.....what you need to worry about is the dome of the piston...im trying to find out how much i can take of before the piston dome hits the cylinder dome,.....
you know what nevermind everyone totally forget about this post,i will figure it out myself.I should have known better to ask technical questions on here because i always get some bonehead who knows everything.Like talking to a brickwall,like they know about technical aspects of an engine...
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Post by Blu02Blaster02 on Jan 18, 2005 18:26:14 GMT -5
the edge of the piston does not pertrude from the cylinder so how whould it hit the edge.....what you need to worry about is the dome of the piston...im trying to find out how much i can take of before the piston dome hits the cylinder dome,..... dude, I just said the piston dome would hit the stock chamber and your still asking how much you can mill it |
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Post by Toomster on Jan 18, 2005 18:30:43 GMT -5
He's right man, you can mill the head for more compression, but that lowers the chamber. Around the squish area, the area that is semi-flat. If you mill too much, you'll just end up milling the squish area, which you can't do. So by rechambering, you take material off the squish, and then you can mill more, and still have a proper squish area.
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Post by hnaoutlaw on Jan 18, 2005 18:32:56 GMT -5
i have run the stock head on my 240 engine ok.....IT WORKS....i am asking how much i can take it down before i start to have problems....IT WILL WORK,I HAVE RUN THE STOCK HEAD ON MY 240,I DUNO WHY YOU KEEP TRYING TO TELL ME IT DOESNT WORK. maybe im not making sense to you...just forget it  |
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Post by Blu02Blaster02 on Jan 18, 2005 18:34:39 GMT -5
ok, then go put it on and ride sense you know it all next time you wont have to ask for help  bonehead |
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Post by hnaoutlaw on Jan 18, 2005 18:37:56 GMT -5
i didnt ask if the head would work.I KNOW THAT.
i asked how much a can take off it and be safe...
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Post by Blu02Blaster02 on Jan 18, 2005 18:39:15 GMT -5
.030 take it off
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Post by hnaoutlaw on Jan 18, 2005 18:39:59 GMT -5
ill figure it out and ill post it on here
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Post by Blu02Blaster02 on Jan 18, 2005 18:50:59 GMT -5
ill figure it out and ill post it on here sir yes sir captain sir! |
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Post by YFS101 on Jan 18, 2005 18:52:04 GMT -5
Here's what you do
Remove the head, lay a few strips of solder across the dome of the piston, re-intall the gasket and head, torque it down and turn the engine over. The piston will squish the solder in any tight areas and give you an idea how much you can take off.
Normally you can safely mill .040"+ off the gasket surface area on a bone stock blaster engine while using 03 or newer OEM Yamaha base/head gaskets.
If your lookin' for power and still want to run pump fuel, keep enough piston/head clearance and mill the head until the compression is up around 160 psi.
As someone already said though the head should be opened up to match the cylinder bore, at the same time the squish band should be leveledas it is off a fair bit on all stock heads.
Mac dizzy has the specs for easy re-chambering the head for the do it yourselfer on his web site. If your already set up with a lathe it's pretty easy.
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