South Africa's First and Only 2-stroke Forum

The LT series engines utilize thrust washers on the small end of the rod instead of the large end like most engines. This seems to be an OK design but the stock thrust washers are prone to breakage and catastrophic damage. below are some pics of broken thrust washers and the damage that they have caused. There are two cures for this common ailment. The first is to rebuild the crankshaft and install washers on the big end of the rod just like the honda 250R. This is not always an option and not the most cost effective way of eliminating those pesky washers. The second method is to machine billet ones. This way you do not have to take the engine completely apart and you do not have to worry about those pesky washers coming apart and runing your day/week/months of riding.

(01-18-2009 06:56 PM)rb0804 Wrote: [ -> ]The LT series engines utilize thrust washers on the small end of the rod instead of the large end like most engines. This seems to be an OK design but the stock thrust washers are prone to breakage and catastrophic damage. below are some pics of broken thrust washers and the damage that they have caused. There are two cures for this common ailment. The first is to rebuild the crankshaft and install washers on the big end of the rod just like the honda 250R. This is not always an option and not the most cost effective way of eliminating those pesky washers. The second method is to machine billet ones. This way you do not have to take the engine completely apart and you do not have to worry about those pesky washers coming apart and runing your day/week/months of riding.

Very informative... thank You



http://s290.photobucket.com/albums/ll253...CF0013.jpg

http://s290.photobucket.com/albums/ll253...1_0033.jpg

http://s290.photobucket.com/albums/ll253...1_0039.jpg

http://s290.photobucket.com/albums/ll253...1_0052.jpg

Here is a picture of a crank with the thrust washers installed on the large end of the rod.



This engine is setup for a big bore long rod. The bigger bore required relocation of the water outlet hole. The cases are also ported.

(01-24-2009 03:43 AM)rb0804 Wrote: [ -> ]Here is a picture of a crank with the thrust washers installed on the large end of the rod.

http://s290.photobucket.com/albums/ll253...G_0707.jpg

This engine is setup for a big bore long rod. The bigger bore required relocation of the water outlet hole. The cases are also ported.

billet ones?

haha, no they do not need to be billet ones to go into the big end. The small end thrust washers are mostly junk from the factory. I am guessing that it is from the process that they use to make them, not to mention that they have a "step" in the washer where the material is very thin.

here is a picture of the billet thrust washers for the small end that fit between the piston and the rod