How do you do a breakin using heat cycling?
- Thread starter Klutch
- Start date
when I did setups at the dealer I let them idle until they reached 120 degrees and then let It cool completely down, usually over night and then repeat 2 more times
On mod motors that's the approach I take... making sure the coolers heat up and the water system is bled completely through.
sled_guy
I like to let them warm up on a stand and then vary the throttle opening to just give it changing rpm. Bring it up to operating temp then shut it down and let it sit overnight like svensdream stated. I also like to do this about 3 times before it hits the snow.
Per Rotax manual warm engine up at idle run 10 minutes. Shut off 20 minutes. Restart run at idle 5 minutes then throttle up to 1/2 throttle hold for 30 seconds return to idle for 30 seconds continue to do this for 10 minutes. Let cool 20 minutes then restart idle to warm up then run throttle up to full throttle at 30 second intervals same process.
I'm with Himark on this one! I have never let it cool down over night. I've owned seven sleds and 5 dirtbikes, all two stroke's. I've never had a catostrophic failure or burn down due to improper break in. Most of these I had for two years plus. I have always heat cycled the engines similar to Himark's/Rotax's procedure except for the wide open for thirty seconds. On my first ride I always premix the first tank per dealer, warm the engine up for about 5-7 minutes then start riding, never holding the throttle WFO for more than about 3-7 seconds. I constantly vary the throttle (tree riding works great for this) and always ensure that the heat exchangers are getting plenty of snow on them. After the first ride like this, I ride it like I stole it. Seems to work for me. My sleds and bikes have always run strong and long.
I should have clarified that I did three warm ups as before mentioned, I never use any throttle, only idling. this allows the nicaseal to seat and get good and hard. I also agree with the other guys on running a pint or two of oil in the fuel for the first tank of fuel. once on the snow I'll put a mile or two on the motor and them ride it like normal. this has worked well for me and my customers, I've never lost a motor, not even an Iq 900.
