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  #11  
Old 01-13-2013, 08:35 PM
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Default Response to best way to test for air leak,

     

Maybe this isn't the best way, but it should work, no leakdown required. Spray some type of aerosol around and into suspect area while engine is running. If the idle rides higher or changes, you have a leak.
That will be bad news, but. You will know where and then u have a start on trouble. Later.

---------- Post added at 09:35 PM ---------- Previous post was at 09:33 PM ----------

Something safe maybe the question, as in what to use....I start high flashpoint and listen for a bog. Low flashpoint will give revs.
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  #12  
Old 01-13-2013, 09:02 PM
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Quote:
Originally Posted by mavrck View Post
went up one size on the main and put new top end in
Depending on where you were at before, just going up one on the main may not be enough. Look in a service manual and start with their suggested setting at your temp/elevation. You say that it seems to be running fine, but you also said you were riding for two hours before you seized the last one...
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  #13  
Old 01-13-2013, 09:37 PM
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IF it was burned down due to lean jetting I would consider richening the needle which will effect the mid range more then a main jet will.
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Old 01-13-2013, 10:20 PM
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Like I said, start with the manufacturer recommended jetting and go from there. May not be perfect, but not going to hole a piston either....
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Old 01-14-2013, 05:44 AM
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wow I cannot believe we have a bike that "locked up" while running, and dragged the back tire, and all we did was replace the piston and run it? Mav, you are asking for it my friend! Just make sure you keep it on the flat cause jumping it could get risky
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  #16  
Old 01-20-2013, 07:43 PM
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i'm confused as why i'm asking for it, i took it to a mechanic had the cylinder cleaned up new top end and re jetted it
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Old 01-21-2013, 08:14 PM
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Well I would have to think that any type of seizure would do some damage somewhere. Did the mechanic give you a reason for the failure?
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Old 01-22-2013, 02:21 PM
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lean jetting or possible air leak between carb boot and reed cage
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Old 01-22-2013, 04:38 PM
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after doing some research the stock jetting is 420 main and 40 pilot,when the bike locked up it had a 370 main and 35 pilot,i think i'm goimg to go with fmf requirements which is 410 main and 35 pilot ,luckly i rode my bike around for a couple 20 and 30 minute intervals and checked the plug and noticed it wasn't getting any better,with the new jetting ,as usual if you want anything done right do it yourself.I asked the mechanic why he went with a 380 main and he said he had know way to find out the stock specks and since it ran lean with a 370 he thought one size up would fix it.I run 32;1 at 1300 to 1800 ft elevation any suggestions would be helpful also has a fmf sst pipe
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Old 01-29-2013, 12:15 AM
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Hey there, just wanted to add 2 cents worth of info on 2 strokes some people might not know.... Remember that a premix bike carries it's nessesary life blood (2 stroke oil) in its fuel... and motocross bikes are mostly designed to run under a hard load, which requires a lot of throttle, which feeds a lot of oil to the engine parts... by running your bike down the street at a medium engine speed and very little throttle opening, you will very quickly dissolve any remove any oil residue built up in the crankcase, not to mention when you coast it, and close the throttle all together... you aren't supplying ANY oil what so ever... In a bike with oil injection, the pump is driven by the engine, and also the oil supply rate is controled by throttle position... so that system better manages the feed of oil to the engine under a specific circumstance, meaning it will be able to supply enough oil to criuse down the road and not seize.... Just saying that starving the main bearings for oil will very quickly wear them out, and then will cause them to have play, and then will start sucking in air at the seals because they are no longer in constant contact with the shaft, and THEN cause it to run lean and seize...

Phew..... sorry for draggin it out but the point is there.... Keep them on the track..!
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