Rebuilt engine break-in - Snowmobile Forum: Your #1 Snowmobile Forum

Foo Fighter · 12-13-2006, 11:12 AM

I'm currently in the process of re-building a 99 summitt 600 engine, and I have a couple of questions.

1: What is the recommended engine break-in procedure for my sled?

2: Should I add oil to my fuel even though its already oil injected? ( So the engine won't be running as hot)

Thanks

FF

**RJ Gleason** · 12-13-2006, 11:16 AM

Treat it like a brand new engine. mix in tank 100:1 with oil injection.
mix 30:1 without oil injection.

upersleder · 12-13-2006, 01:51 PM

i always add oil to the first tank on a top end rebuild. i go 50-1 tho, may be more oil, but never had an issue.

BRPforlife · 12-13-2006, 06:29 PM

Straight from Doo!

"A break in period of 10 operating hours or 500km (300miles) is required before running the snowmobile at full throttle.

During break-in period, maximum throttle should not exceed 3/4. However, brief full acceleration and speed variations contribute to a good break in."

Mix the first tank 100:1, keep the speed varying, and don't go wide open until the rings break in!

badbrad · 12-13-2006, 06:45 PM

handle it like a new sled

Foo Fighter · 01-03-2007, 05:23 PM

Once the first tank is gone with the oil mixture in it, should I just fill up the tank with straight gas?
Also, I'm using bombardier mineral oil for break-in, and was wondering how long should I use this oil? (500km?).
I've been told that once the engine is broken in it would be a good idea to use synthetic oil.

Thanks

FF

**smallengineguy** · 01-03-2007, 05:46 PM

Synthetic oil is cleaner to use. Fill it with straight gas after the first tank. Run the mineral oil almost out, then fill it with synthetic.