pitted cyl head can I use it still?

[yama-doo]

rebuilding a 701 for the blaster and has a greater Yamaha performance head but one of the domes is nicked/pitted up pretty good can i use the head or is it trash?

 

[Talsivar]

it depends how bad it is. if it's not too bad you can lightly sand down the high points. The high points can heat up and cause pre detenation. arn't the domes removeable?

 

[yama-doo]

I don't think they are removable on this type head some of the others like ada are but this one looks to be fixed

 

[Talsivar]

the greater yamaha head i used to have had removeable domes. post a picture

 

[yama-doo]

ok here is some pictures

 

[Scraggly]

pretty sure those come out. i had a similar Pro design COOL HEAD. I wouldnt run that head on anything i cared much about without changing the domes first. there cheap enough.

 

[Dubs chops]

I would say thats trash, A machine shop may be able to machine them to a different (Lower) compression to save it. I'm not sure though.

 

[Dubs chops]

wait a minute i didnt look close enough, Yes i would say those domes come out,

 

[yama-doo]

ok I'll have to look at it again and see how to get them out , anybody know the part number for the replacement domes?

 

[Mouthfulloflake]

put two old plugs in the holes, turn it up side down, and knock the plug heads on a block of wood, the domes shoudl pope right out.

this is the highly technical way that I have always done it.

that dome is trashed too, get another one.

a couple of different heads use those same domes, I MIGHT have some depending on what cc you need.

 

[yama-doo]

Oh heck I get to use my favorite tool (hammer) ........going out to try that highly technical method now

don't need nothing to fancy its just a play around ski with std cyl bore so don't want to high of compression for my use

 

[yama-doo]

:beerchug: ok they came right out both have a 33cc scratched in the top of the domes

 

[Scraggly]

:beerchug: ok they came right out both have a 33cc scratched in the top of the domes

if you are at stock bore and porting i would run 36cc. thats where im at and i get 180psi pump gas safe (93 that is)

 

[yama-doo]

ok yep defiantly want to stay with pump gas

 

[SUPERJET-113]

Pepper city!