What's another good beast to add to the family?

[piezzi]

Okay....I've got a guy lined up right now who wants to trade me his 2005 YFZ450 for my boat.

Can anyone further explain the cooling/lubrication problem mentioned above?

Also, what are some other things to look out for and consider about the YFZ's? Any other known problems?

I appreciate the help!

 

[99LRDblaster]

Okay....I've got a guy lined up right now who wants to trade me his 2005 YFZ450 for my boat.

Can anyone further explain the cooling/lubrication problem mentioned above?

Also, what are some other things to look out for and consider about the YFZ's? Any other known problems?

I appreciate the help!

I think it's 04-06 have lubrication issues with the wrist pin. The 07-newer YFZ's fixed this by putting a nozzle of some sort to squirt the oil towards the bottom of the piston and wristpin to keep it lubricated. The 04-06 don't have this. My buddie's 05 grenaded because of it. He had the oil slinger mod done for about $200 to bring it up to 07-present specs. I've heard hit and miss issues with it. Some people have 04-06 YFZ's and have never had an issue with it and other haven't. You might be fine running a good synthetic oil and routinely changing the oil.

 

[1995blaster]

if it was me for price id get a 400ex thats what i want

 

[piezzi]

It's official.....I no longer own a jet boat, but I now have a 2005 YFZ 450 that will join the Blaster in my garage! I:I

I'm going riding tomorrow and I'll report back with how it goes.

 

[Paulie B]

Congrats on the 450 at least its a Yamaha.
I have a trail banshee that I can't wait to give a full trail report on soon lol
The problem with the shee is its sooooo easy to get greedy with the power.
Mine has stock carbs, head, compression, advanced timing, PC pipes, and a flotek trail port- should be very trailable.

 

[99LRDblaster]

Congrats on the 450 at least its a Yamaha.
I have a trail banshee that I can't wait to give a full trail report on soon lol
The problem with the shee is its sooooo easy to get greedy with the power.
Mine has stock carbs, head, compression, advanced timing, PC pipes, and a flotek trail port- should be very trailable.

A shorter swingarm makes a world of difference in the stability and control of the Shee.

 

[caseywoods5]

another thing, 04-05 yfz's have a 439cc engine and in 2006 they changed the mx rules so 449cc's could enter so in 2006 the yfz went up to 449cc. they gained what yamaha said to be about 10hp.

 

[99LRDblaster]

another thing, 04-05 yfz's have a 439cc engine and in 2006 they changed the mx rules so 449cc's could enter so in 2006 the yfz went up to 449cc. they gained what yamaha said to be about 10hp.

10hp.......LMAO. They have gained a LITTLE bit of power but not much and it wasn't from the 10cc gain. My buddies 05 dynoed in at 42hp with pretty close to an all stock engine minus some lighter internals. The new 2010 YFZs with fuel injection dynoed in around the same amount, but who knows....people always have dynos setup differently and do it with different methods.

 

[caseywoods5]

10hp.......LMAO. They have gained a LITTLE bit of power but not much and it wasn't from the 10cc gain. My buddies 05 dynoed in at 42hp with pretty close to an all stock engine minus some lighter internals. The new 2010 YFZs with fuel injection dynoed in around the same amount, but who knows....people always have dynos setup differently and do it with different methods.

i was reading about it and yamaha claimed the 449cc to make about 10-15 more hp then the 439cc. but it seems that companies always got to say a little something to make sh*t sound better!

 

[Paulie B]

Back in the day my Honda CBR600rr was touted to make 119hp stock. In reality tests by consumers, 98-100hp...

 

[Paulie B]

FWIW fuel injection historically never makes as much HP as a carb.
It does however improve just about everything else like cold weather starting, high altitude riding, low end torque, and in this day the most important feature that is above all, emissions.

 

[99LRDblaster]

Back in the day my Honda CBR600rr was touted to make 119hp stock. In reality tests by consumers, 98-100hp...

Was that a dyno number or crank number? Most bike numbers are crank numbers.

 

[99LRDblaster]

FWIW fuel injection historically never makes as much HP as a carb.
It does however improve just about everything else like cold weather starting, high altitude riding, low end torque, and in this day the most important feature that is above all, emissions.

Yea, it is more efficient and quite frankly, when people start playing with stuff, their jetting is usually not quite "right", which is where the fuel injection shines. It is more efficient and does make a difference in travel distance on the trails. Old age people hate EFI, new age people hate carb jetting.....I like both. Carbs are fun to play with and understand and EFI is nice to tune and setup the fuel programming via laptop.