Blaster Rival racing head.

[BBYamaha]

I have this on the shelf and I’m putting together a 62t motor for the blaster. The domes say 80 mm 41 cc. That seems like the compression will be pretty low...
Secondly did they design this to only have long reach bolts on the 4 corners?
What are the 4 larger predrilled holes on the same side for.


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[joelake]

The 80mm/41cc thing sounds a bit odd....

The 4 "long reach" bolts are for a girdle setup. Bolts go down into the case and sandwich the cylinder.

The 4 holes along the side of the head are for thread in pipe mounts, if your using an "up" style pipe I imagine.

 

[Big Kahuna]

650 Head maybe? Stock is 81mm

 

[BBYamaha]

I thought it came off a 701 but the original owner messaged me and told me he never used that head. Must have come in a box of random stuff.


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[Mattyboy45]

Half girdle?

 

[BBYamaha]

I threw it up for sale somewhere and someone posted that it’s a 800 head.


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[BBYamaha]

If that’s the case I’ll leave it on the shelf for the 800 project.



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[Big Kahuna]

looking at bolt pattern, yeah, it could be an 800 head......