engine techs

norcal ex

norcal ex

X-H2
Location
San Jose, CA
i love the new tech facts, but maybe we should put on with engine facts / engine build facts. like piston sizes for the 650 , 701, 760. and bore sizes and what bore is what size. and maybe a part on how to build an engine. im sure most of us know how, but haveing little hints or tricks would be cool. anyone else like the idea and/or want to do it?:hail:
 
Liquid Graffix

Liquid Graffix

liquidgraffix
Location
In the shop or on the water
Hmm... No one has chimed in for over a year?

I know the standard bore on a 701 is 81mm with oversizing up to 84mm.

Standard = 81mm
.05 = 81.5mm = 701cc
1.00 = 82mm = 710cc
1.50 = 82.5mm = 718cc
2.00 = 83mm = 726cc
2.50 = 83.5mm = 735cc
3.00 = 84mm = 753cc

The 760 starts at 84mm and goes to 86mm.

The 650 starts at 77mm and goes to 79mm
 
Last edited:
SUPERTUNE

SUPERTUNE

Race Gas Rules
Location
Clearwater Fl.
stunts318 said:
Hmm... No one has chimed in for over a year?

I know the standard bore on a 701 is 81mm with oversizing up to 84mm.

Standard = 81mm = 701 cc
.5 = 81.5mm = 709cc
1.00 = 82mm = 718cc
1.50 = 82.5mm = 727cc
2.00 = 83mm = 735cc
2.50 = 83.5mm = 745cc (no piston exists in this size!)
3.00 = 84mm = 753cc (Standard bore for a 760 Yamaha engine)

The 760 starts at 84mm and goes to 86mm.

The 650 starts at 77mm and goes to 79mm
Click to expand...

You have been corrected!
 
Dustin Mustangs

Dustin Mustangs

uʍop ǝpıs dn
Location
Holland, MI
There is a how to on assembling a 701 in the faq. It just gets you to a shortblock or whatever tho, ie no intake, ex, installing it into the hull, ect. I think we could also use a tell all cooling thread. Seems like this time of year about 25% of the banter is about setting up and adjusting the cooling system.
 
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