snowmobra Posted April 4, 2015 Report Share Posted April 4, 2015 What's the best mix ratio to break in a fresh 4 mil motor thanks Quote Link to comment Share on other sites More sharing options...
possum Posted April 4, 2015 Report Share Posted April 4, 2015 I do 15:1 nice and lubricated Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted April 4, 2015 Report Share Posted April 4, 2015 In my opinion a few ounces extra is fine for the first tank or so then after that go normal. 2 stroke cranks with needle and ball bearings dont really need break in. The most important thing about 2 stroke break in is the rings which are being basically filed to mate up with the bore by the crosshatch from the bore hone. You dont want to get the rings hot which is what running across the honed cylinder can do. When hot they expand which can lead to too much expansion , hanging in a portn as well as heat itself damaging the quality and tension of the rings. I am patient about break in. I like to do 3 or 4 very short (30-60 second) startups with no riding to start the ring breakin process with at least 5 mins of cooldown in between. Then I like to idle and blip the throttle for no more than say 2 or 3 mins at a time with the 5 min cool in between. Then I will do a few easy rides of up to 5 mins with cooldowns in between. After that its good but I might still ride easy for the first 10 mins. Quote Link to comment Share on other sites More sharing options...
snowmobra Posted April 4, 2015 Author Report Share Posted April 4, 2015 Thanks bro Quote Link to comment Share on other sites More sharing options...
Tyler S Posted April 7, 2015 Report Share Posted April 7, 2015 When breaking in make sure you don't stay at the same rpm. I would take it easy for the first couple rides. Just make sure you keep woking the throttle up and down, and obviously don't got WFO. I run 20:1 for break in, they say that to much oil can actually cause the engine to run lean. According to physics it's possible but I've never seen it happen. In my opinion if you have that much oil it'll probably gonna run like shit or not run at all. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted April 7, 2015 Report Share Posted April 7, 2015 Break in is the distance from the trailer to the starting line. All this other mumbo-jumbo is crap. 4 Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted April 7, 2015 Report Share Posted April 7, 2015 Start. Listen for odd noises. After a good 5 min warm up. Ride like normal. All this break in stuff and heat cycles and 1/4,1/2 throttle, left turns only, and what ever else you hear is silly. Nothing seats rings better then a good load on the engine. Run the same ratio all the time. Why change shit up? I've never seen a shop do all these things to an engine before they put it on a dyno. But what do they know. 1 Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted April 7, 2015 Report Share Posted April 7, 2015 ^ gets it Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted April 7, 2015 Report Share Posted April 7, 2015 I don't change mixture mostly due to the fact I build a decent amount of motors and any seat time for me is tuning time it's hard to get a good plug read with ridiculous amounts of oil . I'm very diligent with assembly lube on all parts . I do heat cycle a motor and sync carbs while heat cycling. After two heat cycles I ride it like normal but don't string out to death . After first pass I'll make adjustments if needed then plug chop if needed . Quote Link to comment Share on other sites More sharing options...
snowmobra Posted April 7, 2015 Author Report Share Posted April 7, 2015 After break in. WHAT s a good ratio to run the rest of the time. I'm running stock carbs with 310 mains 30p. Thanks guys Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted April 7, 2015 Report Share Posted April 7, 2015 After break in. WHAT s a good ratio to run the rest of the time. I'm running stock carbs with 310 mains 30p. Thanks guysThe same one. Don't change it. Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted April 7, 2015 Report Share Posted April 7, 2015 32:1 Quote Link to comment Share on other sites More sharing options...
Mighty Shee Posted April 8, 2015 Report Share Posted April 8, 2015 I've ran 40:1 since I converted to a 4 mill with stock carbs 3 years ago. It still runs strong. No issues at all! Quote Link to comment Share on other sites More sharing options...
Glorfindel Posted April 10, 2015 Report Share Posted April 10, 2015 More oil = less fuel = more heat. You sont want more heat on a new engine, so keep your ratio the same. I always do heat cycles on my new engines, like Radar Racing do. That never hurt to be on the safe side Quote Link to comment Share on other sites More sharing options...
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