RM 125 Compression

[Suzuki Ridez]

Originally Posted by climb any hill

It depends on elevation, at sea level my shaved .035 head can still run pump..

First thing would be fresh rings & a cylinder hone.

im at sea level, well most of oz is lol. how much difference would i see if i shaved 0.020" off?

[dajogejr]

15PSI, give or take.
Is your crank welded yet?

[Suzuki Ridez]

Originally Posted by dajogejr

15PSI, give or take.
Is your crank welded yet?

that estimate is exactly what ive been after!
i have no idea what welding the crank does?
im a little underinformed.
what does welding the crank do and what does it involve?

[Suzuki Ridez]

Originally Posted by dajogejr

Splitting the cases, having the crank pins welded so they don't separate.
It's an insurance policy...a crank separating in a motor spinning 9 to 10 K is a BAD thing.
All depends on your luck otherwise.

What mods are currently done, and where/how do you ride? What is your reason for being stuck on wanting more compression?

Only mods at the moment is boyesen reeds, none of the machine shops in my state port or anything. all they do is honing.(australia btw)

i want lower end torque and a bit more of a top end i ride sandy trails,fairly aggressive on the bike
and im always on the band and pipe i use the compression of the bike a fair bit but for going through water i need a bit more torque, read up and apparently more torque = more low end and top end.

i dont plan on getting an aftermarket pipe, but if i do probly PC factory works pipe.

[dajogejr]

Low end torque and more top end?? Tall order on a banshee motor.
If you have stock pipes, don't waste your time with shaving the head.

Get a timing plate, advance it to 4 degrees, and get a shaved flywheel....that will increase bottom and mid as well as allow it to rev faster.

[Suzuki Ridez]

Originally Posted by dajogejr

Low end torque and more top end?? Tall order on a banshee motor.
If you have stock pipes, don't waste your time with shaving the head.

Get a timing plate, advance it to 4 degrees, and get a shaved flywheel....that will increase bottom and mid as well as allow it to rev faster.

its for my Rm 125 '93

[dajogejr]

I got caught off guard.
First, start your own thread unless you're looking to share similar info. RM 125 and a twin banshee, worlds apart. You're thread hijacking (which I'll fix in a minute)

Tankinator...sorry...I lost track of who posted what. My bad.

[Suzuki Ridez]

Originally Posted by dajogejr

I got caught off guard.
First, start your own thread unless you're looking to share similar info. RM 125 and a twin banshee, worlds apart. You're thread hijacking (which I'll fix in a minute)

Tankinator...sorry...I lost track of who posted what. My bad.

Oh Sh*t sorry mate.

Well, your advice was helpful.

So any ideas about the 125?

going off your last figures 0.30" or was it 0.20"? you said probably 15 psi give or take.

What would i notice in the way of performance difference?

[dajogejr]

To be honest, I'm not an RM guy...I don't know how much you can safely take off the head, I don't know a single spec on that bike other than it's a 125cc...

Sorry...

[Suzuki Ridez]

Originally Posted by dajogejr

To be honest, I'm not an RM guy...I don't know how much you can safely take off the head, I don't know a single spec on that bike other than it's a 125cc...

Sorry...

Oh damn just my luck :P

im gunna try for the 0.88 mm off the head and take it from there.

is there anything remotely similar to the engines?

would pitting in the squish angle affect the performance of the bike?