enticer 340 heads

[SxViperSman]

Just wondering how much the heads on a 78 enticer 340 can be decked and still run pump gas. Just rebuilt the motor and would like to see a little more out of it now that i know the motor is solid. any other ideas would be great.

 

[Yamaha Nutz]

.020 should be safe with no problems just run premium fuel all it will help with is bottom end and trottle response and it will bring the torque of the motor up a little

Nutz

 

[SxViperSman]

Thanks will give it a try when i pull it out. do i need to run copper head gaskets? going to go to a mikuni 36" round slide as well

 

[900zrcat]

You can cut them .020 and use copper head gaskets, and still have about .060 squish, but the compression will be up there. Prob around 145 with stock porting.

 

[SxViperSman]

Thanks will give it a go

 

[DYsLeXiC]

Sweet...I'm putting dual minkuni 34mm carbs onto my ET340 engine rebuild.... I hope it doesnt blow up.

 

[lapointsled]

Im new to this site, so please excuse my screwups! I just got a 198? 340 excel 3. It needs very little work, How can i tell what year it is?

 

[SxViperSman]

the vin on the chassic will tell you what year it is, i think there is a thread about this.Verify the year of manufacture with the 10th digit. The years 1971 to 1979 and 2001 to 2009 are signified by the digits one through nine. The letters A through Y, skipping the letter I, signify 1980 to 2000. The letter A is recycled for 2010.

 

[SxViperSman]

This is what happens when i added half a tank of regular gas on decked heads. Ran 70mph till this.

 

[wls]

You can cut them .020 and use copper head gaskets, and still have about .060 squish, but the compression will be up there. Prob around 145 with stock porting.

how thick of copper?

 

[SxViperSman]

used the stock yamaha copper head gaskets not sure with out measuring sled at farm right now will have to check.stock part #8G8-11181-01-00

 

[wls]

used the stock yamaha copper head gaskets not sure with out measuring sled at farm right now will have to check.stock part #8G8-11181-01-00

OK, thanks. what's the squish, we are trying to get to?

 

[SxViperSman]

Not sure Yamaha Nutz just said .020 was safe on high test. would have to measure, not sure how to measure squish.

 

[Lasse]

What's the squish, we are trying to get to ?

0,060"