1980 RM125T Squish...

_barty_
Profile picture for user _barty_
Posts
17
Joined
4/21/2019
Location
GB
_barty_
Afternoon all,

I apologise in advance if I'm asking a silly question, but would anyone be able to advise me as to the 'recomended' squish for the mightly little zinger? I'm going to tare down the head tonight and measure up, but have no idea what she should be so to speak!

Really appreciate any assistance guys.

Bart
|
sandman768
Profile picture for user sandman768
Posts
7994
Joined
3/21/2014
Location
Saratoga Springs, NY US
sandman768 8/21/2019 5:38am
8/21/2019 5:38am
Not sure if you’re on Fbook, They have some groups specifically for the old RM”s, you will get some opinions at least.
riv187
Profile picture for user riv187
Posts
545
Joined
2/1/2015
Location
Lakeland, FL US
riv187 8/22/2019 5:20pm
8/22/2019 5:20pm Edited Date/Time 8/22/2019 5:23pm
Mine is .030" with DG head. I ordered a custom copper head gasket .020" to get this. Stock head gasket is .040"(1mm) and resulted in .050".

.030-.035 is ideal.
Stock head is full combustion chamber and has no squish band. Still, you can measure outside edge, and tighten it up with thinner gasket

2
_barty_
Profile picture for user _barty_
Posts
17
Joined
4/21/2019
Location
GB
_barty_ 8/22/2019 11:17pm
8/22/2019 11:17pm
AHH thank you @riv187!

I had an OEM 0.5mm head gasket in stock so have put that in following some initial measurements. See how she goes at the weekend.
riv187
Profile picture for user riv187
Posts
545
Joined
2/1/2015
Location
Lakeland, FL US
riv187 8/23/2019 5:48am
8/23/2019 5:48am
_barty_ wrote:
AHH thank you @riv187! I had an OEM 0.5mm head gasket in stock so have put that in following some initial measurements. See how she goes...
AHH thank you @riv187!

I had an OEM 0.5mm head gasket in stock so have put that in following some initial measurements. See how she goes at the weekend.
the difference should bump compression 15-20lbs. 160lbs is a good compression number for power and rpm without building heat

Post a reply to: 1980 RM125T Squish...