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Old 10-03-2010, 11:02 PM   #1
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Default my brothers dirtbike...has me stumped

i need some help here guys first idk what section to put this in so here it is its a little off brand 50 cc minibike and his mom brought it to me today and said "fix it" said he layed it down and now it wont start i took the carb out cleaned and rebuilt it put it back in didnt start..ok so i pulled the plug kicked it over has an amazing spark and has great ccompression???im stumped never really tinkerd on these little four strokes?dh2 does anybody have any insight or even just to point me in a direction its not crashed up the plastic is fine it was just a low speed lay er down please help me
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Old 10-03-2010, 11:14 PM   #2
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well, if it has spark, air, fuel, and compression, it should be firing. assuming it gets all of those at appropriate times.
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Old 10-03-2010, 11:18 PM   #3
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sounds like a bad rectifier.. The stator makes the spark in a bike with kick start(no battery) however the stator aka magneto makes ac power but the spark plug needs dc power so the rectifier changes ac to dc (or visa versa, to lazy to think intently about it).

Ur stator could also be at fault. I fried the stator in my Raptor and it would still run but it would back and run poorly.
BTW.. for those who dont know... Im a certified atv and motorcycle repair tech.
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Old 10-03-2010, 11:19 PM   #4
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I meant it would buck and run poorly
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Old 10-03-2010, 11:19 PM   #5
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okay well ill check into those tomorrow i hate to cause ive had to deal with stators on ym 650'* oh yeah and update its not a 50cc but a 90 cc
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Old 10-03-2010, 11:20 PM   #6
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and this thing dont start at all ugh im just gonna end up getting fed up and taking it to steve lol
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Old 10-03-2010, 11:20 PM   #7
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4 stroke correct?
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Old 10-03-2010, 11:21 PM   #8
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Quote:
Originally Posted by raptor660 View Post
sounds like a bad rectifier.. The stator makes the spark in a bike with kick start(no battery) however the stator aka magneto makes ac power but the spark plug needs dc power so the rectifier changes ac to dc (or visa versa, to lazy to think intently about it).

Ur stator could also be at fault. I fried the stator in my Raptor and it would still run but it would back and run poorly.
BTW.. for those who dont know... Im a certified atv and motorcycle repair tech.
first off go to bed u got work in the mornin and secondly what the hell is a rectifier i mean what does it look like where would it be located
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Old 10-03-2010, 11:22 PM   #9
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4 stroke correct?
yes sir
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Old 10-03-2010, 11:38 PM   #10
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it will prolly be zip tied to the frame under the plastic by the head tube
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