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Proper break in for 2-stroke engine

Snowmobile How-To's

 
 
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  #26  
Old 01-05-2010
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Quote:
Originally Posted by Triple650indy View Post
I've been riding for 20 years
This could be true but I am guessing your claim of wrenching on them for the same amount of time probably is a little inflated. So either you aren't the age you claim to be or you are a snowmobile prodigy that started his riding/wrenching career at the age of 3.
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  #27  
Old 01-05-2010
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I've been riding since I was 10 and I'm now 36. So thats 26 years. Hummmm
But I've only been wrenching on sleds since I was 18. Thats 18 years so triple has me beat! But what I'm trying to say is that is possible for him to have been working on sled for 20 years! His Father may have been teacing his about sleds since he was 3! This is a NON issue here and I really don't want it to be. Thanks

Last edited by PolarisRich : 01-05-2010 at 04:35 PM.
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  #28  
Old 01-05-2010
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Quote:
Originally Posted by Triple650indy View Post

As far as oil pumps, I've been riding for 20 years and never have I seen one fail. Never have I rebuilt a motor and not seen one pump when its cold. I have never had a single bad experience with an oil pump.
Then you have been lucky... many issues with oil pumps from 20 years ago and some even into today's machines
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  #29  
Old 01-05-2010
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I did, once. The XLT, it failed. Seized the engine a few times. Nothing a hone and an extra set of rings didn't fix....
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  #30  
Old 01-05-2010
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While I haven't been riding nor wrenching nearly as long as most of you, I have been a sort of "gearhead" all my life. From race bikes to 4wd's and now sleds. I followed the procedure from below linked site nearly to the letter on UBR at the builders recommendation.

http://www.mototuneusa.com/break_in_secrets.htm


Oh and I premixed with cheapest oil I could find for breakin at about 30:1 in addition to having pump wired in a half throttle position. Premix every tank and use only synthetics now.
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  #31  
Old 01-06-2010
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had 2 sleds this week with oil injection faliure.
the cost of the premix is basically 5 dollars for some insurance. if you personally are that great of a mechanic wonderfull. but the point of this thread was for the average joe wanting to cover all his bases.

if you really want to see how good your rings are seated remove the exhaust and look for any black on the rings. any black is blow by or unseated rings.
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nothing goes like 3 holes.

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  #32  
Old 01-06-2010
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http://www.polarisindustries.com/en-...f-Service.aspx

the engineers give there advice.
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If the boner police are here I need a lawyer.

in a time of deciet telling the truth is a revolutionary act. george orwell.

aint no body ripin like me. M to the a-d-c-o-w. rock it hard for my fly ladies. I rock it yes in deed. homies still roll with me. money dont change me


nothing goes like 3 holes.

BRTECH HOODS
high performance engineering
aaen performance
millennium technologies
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  #33  
Old 01-06-2010
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Great minds think alike! Great find Jon!!!
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  #34  
Old 04-19-2010
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A thing about seating rings. After your rebuild before you start it check the compression. You'll only see 90-100 lbs. Start engine heat up, burp cooling system, retorque heads, run it WOT for a half hour and check compression again... 120 psi. This is on my Indy 500 which is only used for watercross so it's wide open all the time, also I premix at about a 30:1 ratio.
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