Big bore kit reliability?????
Posted November 29, 2000 - 09:08 AM
Posted November 29, 2000 - 06:55 PM
I believe that Stroker uses a pressed in liner and not a bore and recoat on the cyclinder. I prefer the bore and recoat route as I feel it improves cooling efficiency. I'm sure Stroker and the Sleeve suppliers will say there is no difference with a properly installed sleeve. I disagree with this position.
I have approximalty 1800 miles on the motor since I installed the 417cc kit. I went with the 13.5 to 1 Weisco piston. This means I have to run a little race gas mixed with 92 to lessen the chance of detonation (I use 1.5gal of VP C-12 along with 3.5gal of Union 76 92octaine). You can run the kit with a 12.5 piston just like stock. The 13.5 gives better bottom and mid range performace at the expense of a few hundred RPM on top--more power and torque in the rpm range where I do the majority of my riding.
I have had ZERO problems in the 1800 miles since installation. I feel the vibration level is the same as the stock bike.
99 WR 400
Posted November 29, 2000 - 07:50 PM
Posted November 30, 2000 - 07:44 AM
I've been running the 420 kit with 13.5 to 1 comp for 1 year now with zero problems. My WR is on the MX track 98 percent of the time. The only problem I have on the track is with the gearing. I am thinking of going to a 01 YZ250 or a 01 YZ426.
Posted November 30, 2000 - 05:26 PM
Posted December 01, 2000 - 03:25 PM