tm125 oil pump query

[suzuki447]

gday ,i have tm125 with oil pump fitted but no throttle cable as yet .is there anyway i can tell if bike is running thru oil pump or on premix.(bought bike not finished so not sure if pump is to be used or premix ),any ideas will help .also just picked up another bike fitted with rare GEM brand reed valve block .anyone know about them,thanks don

[brent j]

I would buy a cable and run the pump. I never,ever, had a problem with mine in the 70's and my current one is happy with the pump.

To remove the pump and run pre-mix you need to remove the oil shield on the LHS main bearing and crank and drill a hole, through the case, from the LHS transfer area down to the outside of the main bearing. The flow of fuel/oil will be restricted to the main bearing otherwise.

You can run premix AND the oil pump on a very low setting with no throttle cable. Trouble is I don't know just where to set the pump to achieve this and you still need an oil tank

I got some throttle cables of evilbay for about $10 ea

Can't help with the reed block, Doc is the man there

[Stewy138]

Gday Don,

I am about to try fitting a GEM reed block to my TM125, does yours have a model number printed on it ? I am going to run it on a barrel that has been reshaped at the inlet to have a pseudo-rectangular shape to suit the reed block. I'm a bit concerned that the carby will be pushed back toward the rear of the bike - already without the reed block the carb is a long way back.

Stewy.