05 rappy 660 wont start. - Yamaha Raptor Forum
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post #1 of 49 (permalink) Old 04-08-2017, 02:55 PM Thread Starter
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05 rappy 660 wont start.

This is going to be long. I have searched the forms for days and not come up with a solution.. I have a 05 660 bought It 5 years ago ran great...long story short I was climbing a hill (on the highway) going about 70 mph.. she overheated and the piston came apart. I know my motors and what not but this thing is going to be the death of me....tore it all down split the case to make sure nothing else was wrong. put it all back together with a 686 kit on it. I have all back into the bike...I have checked the timing, both on the crank and cam both line up, (has a little slop in chain when tensioner is out). I have been having issue with it starting...it cranks and crank and backfires through the carb but will not start, called dealer to ask if they knew and guy told me if it died at high speeds change the cam....so what do I do... put stage 1 hotcam into it..did timing an valves all over again double checked all of the timing marks and clearances spot on after 4 full revolutions by hand. try to start and same thing cranks and backfires through carb when given fuel. I have plenty of spark and new plug, but I did pull the plug and it was covered in fuel....so I'm flooding the motor I think...but what doesn't make sense is why will it not even try to start? I rebuild carbs 3 times, with 2 brand new rebuild kits. air fuel screws are set at 1 turn backed out. someone help please.

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Brandon
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post #2 of 49 (permalink) Old 04-08-2017, 05:26 PM
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Mine did same thing bypassed the all knowns to by pass on a raptor it fired right up read the forums bet you'll find answers

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post #3 of 49 (permalink) Old 04-08-2017, 06:17 PM Thread Starter
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ok fully confused now...I got to thinking, and went back to manual to make 100% sure I had timing right.... the manual says to put 2 holes up and lobs down then put on gear with marks lined up properly, but now I have about 1/4 inch of play when trying to adjust valves...I originally set the lobs at 10 and 2 facing up, and valves had good adjustment. what am I doing wrong?
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post #4 of 49 (permalink) Old 04-08-2017, 09:01 PM
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post #5 of 49 (permalink) Old 04-08-2017, 09:03 PM
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Should look like this are you sure your top dead center on your stroke also follow the instructions on timing and valve adjustment on the forums and you can't go wrong

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post #6 of 49 (permalink) Old 04-08-2017, 09:06 PM
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Your lifters are higher because you adjusted them once and had cam in wrong now you just have to readjust them is all let me l know how you pan out im off work in a couple hours

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post #7 of 49 (permalink) Old 04-11-2017, 05:27 PM Thread Starter
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Been fighting with it all weekend.... its going to kill me. ok here it is. I have changed the stator, coil, starter relay, and heat sink thing on side of bike.... it turns over fine now but doesnt even try to start, not even with either. Im still thinking its a timing issue but i timed it to the book and intake is adjusted to .2 MM and exhaust is .25 as per the hotcam stage 1. is it possiable the cdi i fried? if it was it wouldnt spark right?


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Brandon
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post #8 of 49 (permalink) Old 04-11-2017, 07:22 PM
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You said your turns on your screws are only 1 turn out should be around 2 to 3 somewere

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post #9 of 49 (permalink) Old 04-12-2017, 02:40 AM
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It's possible you sheered the flywheel key. Run the "piston" to TDC, then check the timing marks.

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post #10 of 49 (permalink) Old 04-12-2017, 11:52 AM Thread Starter
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piston at tdc lines up with all marks on flywheel and cam gear, (used straw method). when it cranks its flooding the motor. my plug gets soaked in fuel. so i set screws at 1 turn to try to slow fuel down. i will set them back to 2.5 turns, but what my brain is not grasping is why wont it even try to fire off even with either? if timing is good and valves are adjusted then turned by hand 4 revolutions and checked for issues....
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