'07 Yamaha Big Bear no top end power

This is a discussion on '07 Yamaha Big Bear no top end power within the Other Models/Brands forums, part of the Performance /Technical category; I recently rebuilt the top end of my 400 because of a water hole that was alot deeper than i thought. There are 3 marks ...

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'07 Yamaha Big Bear no top end power

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03-11-2010, 12:16 PM	#1
skidplatebob Junior Member Join Date: Mar 2010 Posts: 1 (0)	'07 Yamaha Big Bear no top end power I recently rebuilt the top end of my 400 because of a water hole that was alot deeper than i thought. There are 3 marks on the crank (I), (F) and (T). when aligning the crank to cam i started with aligning the T on crank and piston at TDC with I mark on cam sprocket aligned to case indicator. It started perfect but after half throttle to full it had no power and back fired through carb. I checked alignment a dozen times and cleaned the carb twice and still no solution to problem. I am very confused and really need some help.

aligning marks big bear

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