I just got a YFZ 450 yesterday and started riding it its a great machine and Im planning on racing Hare scrambles. Although after I had rode for about 35 minutes the engine got pretty hot. After I was done riding I let the machine cool for abbout 2 hours when I came back out to check the parking break the engine block was still hot. Im not much of a mechanic so if anyone help me out please I would appricate it. Thanks

 

Stupid question, but what was the outside temp, and was it sitting in the sun??

And what do you mean by "Hot"? Too hot to touch, or warm to the touch??

 

First which question did you think was stupid mine or yours. Next The engine was almost hot to the touch I checked the header and it was about as hot as the engine block. I live in Indiana so it doesnt usally get very hot up here(hottest 80%-90%). I just rode the bike agian today and it wasnt nearly as hot as the first time I rode it. And I usally dont run it wide open all the time.

 

Wow. A little sensitive? LOL [img]i/expressions/face-icon-small-wink.gif[/img]

I was talking about the question I was asking.
2 hours seems like an awful long time to be hot.???

Oil level ok?
Coolant level ok?
Air filter clean?
Properly jetted?

 

So you have a YFZ also cool. What do u think of Banshees and other two storke Machines are they exctinc or are they still rulling in the sand dunes dominating drag races. I just rode it alittle while ago but and everything was running peferctfly Iam starting to find that explosive power in accelartion and strait away speed. It also handles about 3 times better than any other qaud ive rode and never wants to tip like the Raptors. It looks like it might storm so had I put in the bike in the garage. Weve had alote of unsall wether this summer in Indiana. Ive also checked everything you mentioned about my YFZ 2fun[img]i/expressions/face-icon-small-wink.gif[/img]

 

No, 2-strokes are not extinct IMO. They are still great quads to use for the dunes! The built Banshees still beat everything out there (as far as I have seen) in a drag race. As far as the YFZ is concerned, I just like the power you have stock, and with an aftermarket pipe and airfilter.

The YFZ is much more fun to ride, and has way better handling IMO, but the Banshee is a kick in the pants when the powerband kicks in. [img]i/expressions/face-icon-small-wink.gif[/img] (at least in the dunes anyways). Banshee tends to wear you out faster though because of how the powerband hits (all at once).

I also still have a 250R that has been built to the hilt, and set up for duning. I actually preferred my 250R compared to my Banshee, just for the handling characteristics, and power delivery if nothing else.

I have not found anything that my piped YFZ cannot make it out of yet. Seems to have plenty of power on tap when needed, plus I can totally lug it when necessary. No clutch work necessary at all. [img]i/expressions/face-icon-small-wink.gif[/img]

 

Quadman-I keep hearing about tippy raptors- Why? I have had my raptor sliding sideways for some pretty long distances and never felt that it was a tippy machine. I've also crossed some pretty steep hills and still never felt this way. I suppose if I was making some 90 degree corners on pavement going real fast- maybe I might feel this way? If anything I think yamaha should have extended the swing arm a couple inches. Those are my thoughts though and I'm sure someone else feels differently

 

I don't think they are uncontrollably tippy per say.
He is comparing it to a YFZ. In that case, the Rappy is a little more tippy.

Like you said, if you know how to ride it, you won't have much problem with it.

 

getting back to the post, the engine was hot because it was new. The tight clearances were creating a little more friction, and it will reduce over time while you break it in. Thats why you dont want to push it too much during break-in, since too much heat could toast the rings and bearings and cause your engine to wear out sooner than it could. A few short burst of wide-open is fine, helps the rings seat better, but dont beat on it too much, and avoid excessive high rpm for a few hours and you'll be just fine.

 

I actually broke mine in just the opposite.
Went to the Motoman site, read up on his thoughts, advice, and reasoning, and was sold on the idea of really "getting on it" during break in.
According to him, 80% of the break-in (ring seal) occurs within the 1st hour, and the last 20% takes considerably more time.
Load the motor right off the bat, and go through full throttle acceleration, and full deceleration.

Had lots of TRX450R Honda owners say my bike is faster than most YFZs they've gone up against, so there must be SOME truth to the Motoman break-in method. [img]i/expressions/face-icon-small-wink.gif[/img]