New motor break-in

[marc001]

I've read the manual and I know what the mechanic told me about the break-in miles on a new 4 stroke, but does anybody have other ways of engine break-in? I'm not putting a load on it or holding full throttle. Keeping it below 6000 rpm for the first 100 miles or so is tough! Wasn't sure about 4 stroke break-in miles, I've only had two strokes in the past. Thanks!

 

[cmharcou]

Best thing to do in my opinion is to find a flat stretch of trail adn hold it wide open for 5-10 miles. Then shut it off until its cool and do it a few more times. It'll run forever then. It heats it up and seats the rings good.

 

[ranger1]

One of the most important things to remember is to vary the throttle/speed. Do not maintain the same RPM. Good to crack her open once & awhile also.

 

[jagabom]

On my machines I like to go for a 50 mile drive. Going from zero to 6000 RPM and then back down to zero. This takes a long time but I like it. Seats the rings at all RPM's. A snowmachine is an engine also. I like what the manual says.
Jim
08 APEX

 

[Teamblue4]

Just change the oil and filter after 500 miles, that is the best thing for the engine.

 

[guardrail]

After the engine is at operating temperature, I would hold mine until it hit around 9-10,000 rpm and let off. I wouldn't do any long constant rpms. Varying the engine speed is important. I did this combined with normal trail riding for the first full tank of gas, around 80 to 100 miles, when I broke in my sled this way 11,000 mile ago. I never had any oil usage issues. Everybody has their own way of doing this. This worked for me. There are a lot of threads and opinions on here about break-in.

 

[Riceburner]

I've read the manual and I know what the mechanic told me about the break-in miles on a new 4 stroke, but does anybody have other ways of engine break-in? I'm not putting a load on it or holding full throttle. Keeping it below 6000 rpm for the first 100 miles or so is tough! Wasn't sure about 4 stroke break-in miles, I've only had two strokes in the past. Thanks!

Are you using it already? If so you are too late.

If not, heat cycle it 3 times over three days at between idle & 3,000 ish rpm or so. Take up temperature until the heat light comes on and a little more. [once heat light comes on take your hand off throttle so it will auto shutdown if it gets to max temp.]

When you ride it first time put on an old belt and load and unload it a lot for the first 300 miles. [Throttle on - Throttle off] You need to load it. I believe Yamaha says no " sustained" operation over 6,000 etc. They do not say don't go there at all as I recall.

 

[Irv]

Good read here, and like what has already been mentioned, you'll see heat cycles is very important.
http://motorcycleinfo.calsci.com/NewBike.html#BreakIn