head or valvecover?? - Snowmobile Forum: Your #1 Snowmobile Forum

Renagade · 11-01-2012, 11:19 AM

i have been dismantaling 2-95 formulaIII,s to do pistons
on the one i ride. other sled is a parts doner with a
destroyed crank & 1 bad jug & piston.
my question is- on the sled i ride the temp guage
sensor is in the head. on parts sled its in valve
cover??
the parts sled doesnt even have a hole for the
sender in head. so what place is better??
the head on sled i ride has a plug in the v-cover???
funny thing is the vin numbers are only 53 apart
so what changed ??????

**smallengineguy** · 11-02-2012, 03:47 AM

Go to www.hlsm.com and check the microfiche for different years. Maybe they will show both.

Renagade · 11-02-2012, 09:50 AM

why thank you sir

Renagade · 11-02-2012, 08:16 PM

well.............
it doesnt show a hole in the head
on any of the 600 heads!!!! any years???
so now im wondering why i have one. lol

**smallengineguy** · 11-03-2012, 05:41 AM

Not sure. My 617's all have the hole in the head (top cover), not the cylinder.

aduck · 11-04-2012, 09:00 AM

my 670 is in the head as well. wonder if it was tapped in??

Renagade · 11-04-2012, 04:48 PM

ill take a pic 2marro & send it to ya. lol

Renagade · 11-04-2012, 09:13 PM

ok??
its got a 98 formulaIII 600r head on it
if compaired in pictures.
what does the R mean?

**smallengineguy** · 11-05-2012, 03:51 AM

Wonder if it's been apart and they tried to change the compression ratio or something?

Renagade · 11-05-2012, 07:13 AM

Quote:

Originally Posted by smallengineguy

Wonder if it's been apart and they tried to change the compression ratio or something?

that the fun of an older sled i guess?

does the "R" mean race? rocket? rancid??

**RJ Gleason** · 11-05-2012, 06:32 PM

Rotax.

Renagade · 11-05-2012, 07:43 PM

Quote:

Originally Posted by RJ Gleason

Rotax.

lol. ya but 2 totally different heads.
ill send a pic to aduck, or roof991.
maybe they can upload it, im not good
with pics.

Roof_991 · 11-05-2012, 08:07 PM

heres the two heads he is talking about

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Roof_991 · 11-05-2012, 08:08 PM

im going to say that someone probably drilled and tapped the one and relocated the sensor. and the R deffinetly has to stand for race lol

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Renagade · 11-05-2012, 08:12 PM

Quote:

Originally Posted by Roof_991

im going to say that someone probably drilled and tapped the one and relocated the sensor. and the R deffinetly has to stand for race lol

well the fisch shows front head for a 98fIII 600r,
the top one is standard 600??
so im not sure.
but deff a factory plug & tap.

aduck · 11-05-2012, 10:32 PM

use the r head probably have a bit better compression