O.S. Crankcase (Speed .21)

This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
Low Price: $96.99
Discontinued Online

This is a replacement main engine crankcase for the O.S. SPEED 21VZ-B V-Spec Off-Road Competition Buggy Engine.

This product was added to our catalog on July 18, 2007.

Charles Brigance
Wednesday, Oct 14 2009 (about 7 years ago)
O.S. Crankcase (Speed .21)
Here is a new one. OS " racers are over reving the engines when clearing them out or warming them up on the starterbox" thats why the cases are cracking. WTF!!! Anyway don't buy the os23751020 buy the updated case os23751030 I have 2 races on this case so far so good. -//- Ricky is 100% correct. I have cracked 2 of these cases and O.S pulled this no warranty because it a racing motor crap!!! Thats all good but the case should last longer than 1 raceday. The tech at O.S all but admitted there is a problem but stated the following: "The crack was caused by the crank or the rod being out of balance or the mounting bolts are comming loose during driving causing tweak on the engine case or chassis flex is causing the break". I run the losi 2.0 and use the losi quick change engine mount so I know thats not the issue. I was at revelation last week and had several people tell me their OS Vspec and speed had done the same thing in various brand buggies. The price we are paying for these motors and the price to replace the crank case OS should at least give us a price break. It's bad enough the bearings are trash now we need to replace crank casses too?)
ricky racer
Sunday, Oct 11 2009 (about 7 years ago)
O.S. Crankcase (Speed .21)
Just to let you know,I had a old os speed case and swapped cases ran it two weekends in a row with no problems.Hopefully it will take more than a couple of races this time,I really like the motors.Oh,I didn't have any loose engine mount screws those big company's never take the blame.They just need to let us know when the new cases will be available. Fast and Smooth; Ricky -//- Great motors,but i have been cracking cases.Are these cases shown on amain the new version,there should be a new batch made,don't buy the old ones.)