YZ300

PC wrote:

I've got an 06' yz250 with a Powerseal-made 285 top end. It's a brute, for sure, but I really wish it was back to stock. I've...

I've got an 06' yz250 with a Powerseal-made 285 top end. It's a brute, for sure, but I really wish it was back to stock.
I've got the squish real tight and compression reads 230#, so it requires race gas or retarding the timing 1.0 - 1.5deg. to not detonate, but I honestly think the stock motor with the squish corrected was funner.

The big bore motor (with stock timing) barks super hard off the bottom, which makes the mid and top feel very uninspiring. The bike used to have an awesome midrage surge that was fun as hell, but it now one seamless transition through the powerband like a 4T motor. Effective, I suppose, but not very exciting. I would like to get a new head and have it setup with less compression to tame the bottom end a little, but that requires time and effort, which is in short supply these days.

I've spent thousands trying making this thing a woods monster, but its too abrupt, makes shitty traction and is too twitchy for my liking. I gave up on making the YZ a woods bike and bought a Husky 300, which is EXACTLY what I wanted my YZ to be like without the tuning headaches. Not saying my YZ isn't an awesome machine, but its a little too aggressive and fast steering for my liking in the woods. A pro would probably bust a nut on the YZ, but my mortal ass much prefers the purpose-built enduro bike. In the end, I wish the motor were back to stock and I didn't have to buy $200 pistons from MaxProfit.... I mean MaxPower. My motor has been bulletproff though.... built in 08' and has only been apart once for some new rings.

Some helpful info about pistons. Maxpower has the exclusive rights to distribute the 285 piston (made by Wiseco) and they charge $180 for the piston and another $20-30 for rings (at least this is what it cost in 08'. The last time I bought one). You can build a 265 or 275cc motor and use off-the-shelf (aka cheap) oversize CR250 pistons. The 295 kit (Gorr's) is probably pushing the limits of the cylinder as it cannot use the head o-rings anymore and uses old skool steel gaskets like they did back in the day. Haven't heard of any failures though.

If you do end up doing this then buy a used, low-hour YZ and have a tuner build the motor for you. No point paying $10k for something that could be done just as well for less than half the price. And fuck you Yamaha for selling the same bike for 6 years with no changes except a higher MSRP! Buy used.

unknownmxr wrote:

The only yz riders in off road are old guys with sentimental attachments and motox guys who ride part time in HS. The issue with the...

The only yz riders in off road are old guys with sentimental attachments and motox guys who ride part time in HS.
The issue with the yz is the narrow ratio transmission. You can get a larger tank, a rekluz clutch and change the sprockets, but it is not possible to add a 6th gear or even change trans ratios.
Get a ktm xcw. Resistance is futile.

hartebreak wrote:

in that vid of the Gas Gas when showing the bars, the cam moves over to the left and shows the hydraulic clutch and another lever...

in that vid of the Gas Gas when showing the bars, the cam moves over to the left and shows the hydraulic clutch and another lever resembling a hot start. What is it??