When I built my snow bike I paid more money to find a wr, cheap yz450 everywhere, just so I could have the e start button. Soon found that I had bought into a poor design execution. My electric start is only fair.........being kind here to Yamaha.
What I found is:
if the starter engages just as engine is coming up to compression cycle, starter doesn't want to turn the engine over.............dah, where is your engine coasting to a stop likely to stop, well stopped by the compression stroke.
I was told the same motor ( close copy sort of ) in the 4 wheelers were great starters ( never owned one, any feed back on that ). Use the atv starter. Borrowed one to see, if I had correct model for atv, doesn't fit. They are a bigger motor, might be able to be modded to fit. Might dive into that later...........anyone had experience with that ?
bought chineese aftermarket starter for $100, has more power than oem $250 plus yamaha starter, cranks better, suggestion was made to do this by two longtime Yam techs.
I think the relay on the wr is also weak link in the system. Likely does not have enough contact surface to transmitt power when starter loads aginst compression, new $11 relay works better............for awhile, probably until contacts get dirty.
Wire from battery to relay to starter is weak. Not sure its big enough capacity to really zing starter aginst compression. Tested this, when I run heavy jumper wire from battery direct to starter chit happens, hit buttom through relay, not so good, slower cranking.
So, cranking the starter steals enough juice from iginition, none left to fire plug, old automotive story from way back. You crank engine with starter kind of tries to fire, easy kick on kickstarter fires right up.........real poor setup Yamaha.
So easy way to wire around this ?
What I found is:
if the starter engages just as engine is coming up to compression cycle, starter doesn't want to turn the engine over.............dah, where is your engine coasting to a stop likely to stop, well stopped by the compression stroke.
I was told the same motor ( close copy sort of ) in the 4 wheelers were great starters ( never owned one, any feed back on that ). Use the atv starter. Borrowed one to see, if I had correct model for atv, doesn't fit. They are a bigger motor, might be able to be modded to fit. Might dive into that later...........anyone had experience with that ?
bought chineese aftermarket starter for $100, has more power than oem $250 plus yamaha starter, cranks better, suggestion was made to do this by two longtime Yam techs.
I think the relay on the wr is also weak link in the system. Likely does not have enough contact surface to transmitt power when starter loads aginst compression, new $11 relay works better............for awhile, probably until contacts get dirty.
Wire from battery to relay to starter is weak. Not sure its big enough capacity to really zing starter aginst compression. Tested this, when I run heavy jumper wire from battery direct to starter chit happens, hit buttom through relay, not so good, slower cranking.
So, cranking the starter steals enough juice from iginition, none left to fire plug, old automotive story from way back. You crank engine with starter kind of tries to fire, easy kick on kickstarter fires right up.........real poor setup Yamaha.
So easy way to wire around this ?
