Installed 13:1 in my YFZ
#1
Installed 13:1 in my YFZ
Well I put in the 13:1 piston today but the gasket set will not be here until tomorrow. My yamaha dealer is messed up. I called them this morning to see if my piston was in and they said they where on backorder for 2 weeks so I had him cancell my order. I called a yamaha dealer back east and they had 1 in stock so I had them ship in next day air so I could have it running for the weekend. I go to the yamaha shop to get an oil filter for my quad and guess what he had? My piston showed up and he made me buy it since I ordered it which I guess is fair. The only part that sucks is I have 2 13:1 pistons, so if anyone is interested in it I will ship it to you for free. Email me if your interested. jeremypreston450@hotmail.com
#4
Installed 13:1 in my YFZ
No I am not going to change the cam because the duration and lift are the same as the yz bike cam all you have to do is retard it 1 tooth and it makes it timed just like the yz. The piston adds 1.5-3hp depending on where your at in the rpm range. YFZn has rode one and he said it has more torque and is a lot snappier. The piston cost 180.00 and I will ship it for free. The piston are very easy to change. If you can do the cam mod you can do this. The stock compression is 11:9
#7