View Full Version : Disable oil injector and pre-mix ratio for lt80

02-27-2007, 08:26 AM
Hello. I have an lt80 (2001) that had low compression. I have removed the piston and cylinder and itís in the shop being reworked. The piston was heavily worn, with deep gouges thru out. The shop could not say it was lack of oil (the injector could have run dry at one point and it overheated-I was not the original owner). They recommend disabling the injector pump (kit runs $35.00) and running pre-mix. This certainly guarantees no oil problems in the future. My question is; they recommend a ratio of 32:1 (5oz of oil to 1.25 gallons of gas). Does this seem reasonable for this bike? There are no specs for this on the bike that I am aware of. The last thing I want to do is damage a new top end rebuild. Thanks in advance.

Bryar Riley
02-27-2007, 06:39 PM
Yes that is good.... we sometimes run 50-1 at races....so 32-1 should be fine..............

02-28-2007, 07:55 AM
32:1 is corect by my thinking. Some oils are made for 50:1.
$35 seems high for the kit. All they have to do is pull off the lil plastic thing that drives the pump on the end of the crank.

03-12-2007, 09:10 PM
I am going to change my son's lt80 to pre-mix also. Do you need to pull the oil injector pump out also and put in a block off plate, or just disconnect the "plastic thing"?

03-13-2007, 10:17 AM
The plastic drive is the only "have to". The rest is bling. :)

03-21-2007, 12:47 PM
Any pics of the injector while you had if off? If so I would like to see.

03-22-2007, 09:24 AM
Mark, We don't take the injector pump off. We remove the lil plastic t[iece that drives the pump. It's on the end of the crank shaft.
After that, you can use a piece of toothpick in the line or byuy a rubber piece to block off at the carb.

03-22-2007, 09:38 AM
Thanks Jack.