800 top end on 700 bottom end???
- Thread starter dmaxd2500
- Start date
I don't think so, I think the cases were a little different and also the 800 had a 2mm longer stroke
The 800 cylinder have the same bolt pattern on the base and head geasket areas you would need to bore the upper cases to 95mm to take the 800 cylinders.
The port timing in close and will work if there not ported.
But as far as the crank or upper rod bearing there is only 2 ways to use the 800 cylinders.
The 700 has a 20mm pin and a 25mm upper rod
The 800 has a 22mm pin and a 27mm upper rod
You would either have to use a 800 crank or find a bearing set up to work with a 22mm pin with a 25mm upper rod you may be able to find separate pins like a Seadoo watercraft or Skidoo engine the smallest pins I know of are 2mm but your going to need 1.5mm roller pins ad about 30 per rod.
Other then that I would search for a Big Bore piston for the 700 with the 20mm pin.
I know of someone that did a big bore kit for the 700 I will try to find the info.
keep you updated
The port timing in close and will work if there not ported.
But as far as the crank or upper rod bearing there is only 2 ways to use the 800 cylinders.
The 700 has a 20mm pin and a 25mm upper rod
The 800 has a 22mm pin and a 27mm upper rod
You would either have to use a 800 crank or find a bearing set up to work with a 22mm pin with a 25mm upper rod you may be able to find separate pins like a Seadoo watercraft or Skidoo engine the smallest pins I know of are 2mm but your going to need 1.5mm roller pins ad about 30 per rod.
Other then that I would search for a Big Bore piston for the 700 with the 20mm pin.
I know of someone that did a big bore kit for the 700 I will try to find the info.
keep you updated
Engine-Tech made a nice 770 kit for the 700s.
Second that. Art Sever has a good rep and nice prices. You should limit the amount of $$$ you put into this thing, it wont pay of compared to what you get these days.
Here is the link to his website: http://www.engine-tech.com/shop/index.php
Dont see the 770 anymore, but call him and ask.
RS
psi makes a kit , that takes your 700 and makes it an 800 they are claiming 162 horses with there pipes .
Just to let you know, Price Performance makes just that size roller pins, only it's for a 23/20mm combo and not 25/22mm. Believe it was 28 roller pins but ask Mark at Price if you want to pursue it.
http://pricepower.net
RS
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