The quest for more power begins.....
Posted October 31, 2006 - 03:38 AM
I got the JE 12.8:1 piston kit rather than the JE (or Wiseco) 13.5:1 kit because of fuel quality concerns where I live. The 12.8:1 piston should provide a nice little boost to power over the stock 12.3:1 in my '05 WR450F.
As for the Hotcams, I have decided to get them over a YZ cam because for the price I have to pay, both the YZ and hotcams exhaust cams cost the same. May as well go for the set while it's all apart, hey?
Here are the gains of a set of hotcams over the YZ cams:
Should be a very nice boost over my stock WR cams!
They should be here in Australia early next week from atvunlimited on ebay, I will have to post some pics and maybe a guide or two on how to change a piston and how to re-shim seeing as no one with a Yamaha usually does these things.
I have my engine all torn down at the moment, I must say that I was taking it real easy and it only took me 1/2 an hour. For any of you out there thinking of doing the same, don't be worried. It is a very easy job to do.
I will let you guy's know how it all goes.....
Posted October 31, 2006 - 11:26 PM
did your '05 really need to be torn down and rebuilt so soon ?
Posted November 01, 2006 - 12:27 AM
I have about 5,000kms (~3100 mile) on the clock now and I started hearing a noise that was not normal. I checked the valve lash and the right inlet was opened .15mm out of spec. That is not normal, so I tore the inlet cam out to check the valve cap out. They seem OK, but the top of the right valve stem looks a bit shiny compared to the other inlets. I thought I may as well check the other side now. I took of the head, there was a fair bit of carbon build up on the top of the piston and the head. I cleaned up the head, all the valves still look like new, not cupped or anything. I should have taken pics of the carbon build up, but I will of everything else.
Anyway, pulled the barrel off (one more nut) and took the piston off to give it a clean and check. I must say that I am impressed with it all, there is no signs of detonation, just carbon build up. I haven't bothered to check the piston ring gap, I thought may as well throw a new piston kit in anyway.
So now I sit and wait for my goodies to come from the states! I have always wanted to throw in a cam weather it be a YZ exhaust or the set of hotcams. My procircuit exhaust adds a ton of punch to the bottom and mid, but I feel it goes flat on top. To be honest, I wasn't going to get hotcams untill I saw them for $US300 a pair! As you know, they are like $300 each here! I also thought if I throw in a piston now, it should be good for another 5,000kms.
Posted November 01, 2006 - 01:22 AM
my GYT-R pipe gives me a similar result that you get from the PC and at the moment i'm happy with that - just glad to enjoy the ride ...
... still gonna keep watching these updates though !
Posted November 18, 2006 - 07:52 AM
What's the latest update? How long before you get your new piston and cams??
You must be going nuts having to wait:banghead: