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01-18-2012, 07:01 PM
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#1 (permalink) |
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Moderator
  
Join Date: Oct 2011
Location: Caldwell Idaho
Posts: 512
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whiteboyzracing need help!
i need help? i have an 07 yfz 450 it had a hole in the left inner crankcase so i toar into the motor replaced the case put the motor back together timing was dead on started it ran perfect idling in the garage for 20 mins revin it up everything seemed fine...next day brought it to my buddies to finish putting it together started it it idled for about 10 mins then quit like it was cold dint make no hard noises just shut off went to restart starter jst grunted so i removed stator case plug and tryed turning it over by hand it would only turn so far tryed turning it backwards still only so far took the head off turns over fine....none of the valves are bent and the timing was dead on like i said...is there any explanation?
thanks in advance everyone
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 2012 yfz 450r |
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01-18-2012, 09:54 PM
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#3 (permalink) |
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Senior Member
Join Date: Aug 2011
Location: Warren, PA
Posts: 569
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Not to jack the thread but I've been wondering since the first time I saw your quad ctown, what tires are those?
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Paul York #77 York Racing "RACE FOR A CURE" 2005 YFZ450 Modifications from York Racing, Pro Armor, Hot Rods, Wiseco, ITP, TUSK Offroad, and MAXXIS. Big Thanks To All Of the People Who Have Helped Me Over The Years: Mom And Dad Grandpa And Grandma Tom Carlson At TC Racing Nate McNett At McNett Performance ~In Loving Memory Of Dave Morelli, Thanks Grandpa~
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01-18-2012, 10:03 PM
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#5 (permalink) |
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Senior Member
Join Date: Aug 2011
Location: Warren, PA
Posts: 569
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Shweet! Thanks bud. I like those rears but I will go with some good ol' turf tamers for $35 a peice haha. I'm cheap sometimes.
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Paul York #77 York Racing "RACE FOR A CURE" 2005 YFZ450 Modifications from York Racing, Pro Armor, Hot Rods, Wiseco, ITP, TUSK Offroad, and MAXXIS. Big Thanks To All Of the People Who Have Helped Me Over The Years: Mom And Dad Grandpa And Grandma Tom Carlson At TC Racing Nate McNett At McNett Performance ~In Loving Memory Of Dave Morelli, Thanks Grandpa~
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01-22-2012, 09:32 AM
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#7 (permalink) |
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Junior Member
Join Date: Jan 2012
Location: Bolton landing ny
Posts: 19
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Is there any chance It could of jumped timing? Didnt really check it when we took it apart but there is no marks on the valves or on piston and the valves aren't bent so I didn't think that was it but could it? And It was running a little hotis that from just not having oil everywhere in the motor for the first start or not having the air box on?
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01-22-2012, 10:40 AM
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#8 (permalink) |
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Police Patrol
Join Date: Sep 2005
Location: Parker, Colorado
Posts: 3,119
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I would start checking to see if it had compression, or do a leak down test. I hope you did not run it that long with just an open carb, as you said that you didn't have the airbox on. If you did, it would be running way too lean, and that would cause the engine to heat up, and could have caused it to seize the piston. If it were me, I would take the top end back apart, check for damage, then re-assemble it. It could have jumped time, but you definitely have something going on...
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TEAM TRIGGER RACING (Now sponsored by AMSOIL, Vickery Motorsports, MotoXNutrition,DZ Graphics, Engine Ice, DeRisi Racing, Team Ape, Cosworth Pistons, Hiper, Lonestar Racing. Terse 07 Race engine 2007 Blue YFZ: Venom 14:1 piston, Cam Mod, Jardine RT4 Exhaust, 175 main, 45 pilot, 04 needle 3rd clip/ 3 t Become a fan of Team Trigger Racing on Facebook!!! |
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01-22-2012, 11:41 AM
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#10 (permalink) |
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Police Patrol
Join Date: Sep 2005
Location: Parker, Colorado
Posts: 3,119
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A worn timing chain, guides, or tensioner can cause it to jump. That is it.
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TEAM TRIGGER RACING (Now sponsored by AMSOIL, Vickery Motorsports, MotoXNutrition,DZ Graphics, Engine Ice, DeRisi Racing, Team Ape, Cosworth Pistons, Hiper, Lonestar Racing. Terse 07 Race engine 2007 Blue YFZ: Venom 14:1 piston, Cam Mod, Jardine RT4 Exhaust, 175 main, 45 pilot, 04 needle 3rd clip/ 3 t Become a fan of Team Trigger Racing on Facebook!!! |
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01-25-2012, 05:13 PM
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#13 (permalink) |
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Junior Member
Join Date: Jan 2012
Location: Bolton landing ny
Posts: 19
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Ok well I started putting my yfz together I checked every thing over but can't find a problem. I put my exhaust valve in and it moves fine but I put the intake valve in and it won't spin the bearing is fine it will spin in my hand fine. But as soon as I put it in the head even with the cap off it still is just locked won't spin. It's really making me mad.
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01-26-2012, 01:19 PM
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#15 (permalink) |
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Senior Member
Join Date: Aug 2007
Location: NE OH
Posts: 823
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If your intake valve(s) are stuck, you could have worn/shot valve guides. Without springs, retainers, clips, etc, your valves will slide pretty much freely. If they are sticking, something is wrong. With the intakes stuck, your cam cannot turn which may be the cause of it locking up. Do you have the proper lash & clearances on your cams?
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2009 YFZ450R Baldwin, DP, DID, Houser, K&N, Maxxis, LSR, PD, PEP, Rath, RPM, Sparks, SunStar, WorksConnection Waiting on Six5Designs for my YFZR stuff. =) Special thanks to Baldwin Motorsports |
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