Cutting out at high rpm's - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 6 (permalink) Old 02-17-2017, 03:57 AM Thread Starter
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Cutting out at high rpm's

So I picked up a yfz a while ago and it ran great and the power felt good throughout all the gears. I put a new HMF exhaust on (already has fmf head pipe and no intake box lid) and jetted it myself and it ran great minus some exhaust backfiring. so a couple weeks later i decided to try to rejet to see if i could fix the exhaust popping, then I started experiencing problems with it cutting out in the higher RPM's. I have tried at least 30 different jetting/fuel mixture setups on it and different brands of jets with no success. And that's when I decided to let the pro's handle it, At least that's what I thought they were.


So 18 days later I got a call from the shop saying my YFZ was ready to be picked up. went to test drive it and it still cuts out on high rpms throughout all the gears. The Carburetor has been rebuilt, new carb joint, every seal has been replaced and new exhaust gaskets. $400 later it still runs like crap.

I told them I wasn't happy with it and it runs worse than when I brought it in. Then the mechanic somehow magically knew that it was the spark plug cap and told me they would try to see if that fixes it, so I said whatever.

I was originally told the price would be no higher than $200. do you guys think I should pay the $400 when the bike runs the same way as before? I understand they put new parts on and rebuilt the carb and that did make it feel smoother/more responsive. But my original issue has still not been resolved.

I'm going to pick it up in the morning and fix it myself. I have done some research and it sounds like it could be TORS, bad coil or stator going bad. I am positive this is not a jetting issue.
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post #2 of 6 (permalink) Old 02-18-2017, 03:48 AM Thread Starter
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Thought I would let you guys know what the problem was just in case anyone else experience's the same issue I had. They spent over 8 hours trying to figure out what the issue was and it turned out to be the carburetor had a crack in it. so I got a new one along with a Boyesen Quickshot 3 on it and it runs great and the bog is completely eliminated now.
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post #3 of 6 (permalink) Old 02-18-2017, 10:18 AM
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Did they still make you pay for the $400?

2016 Yamaha YFZ450R SE
2007 Yamaha YFZ450 SE (SOLD!)
2002 Yamaha Raptor 660R SE
2003 Yamaha YZ250F
2006 Suzuki RMZ250
1993 Suzuki LT230E
2003 Polaris Trailblazer 250
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post #4 of 6 (permalink) Old 02-18-2017, 02:28 PM Thread Starter
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More like $780 lol. They spent 12 hours on it but only charged me for 4 hours. Plus part of my harness was melted so they fixed that, new spark plug cap, new carb and the Boyesen quick shot.

I would have never found the crack in the carb myself so I'm not really complaining. It runs great now
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post #5 of 6 (permalink) Old 02-18-2017, 05:55 PM
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Quote:
Originally Posted by MLILLYBOOSTIN View Post
More like $780 lol. They spent 12 hours on it but only charged me for 4 hours. Plus part of my harness was melted so they fixed that, new spark plug cap, new carb and the Boyesen quick shot.

I would have never found the crack in the carb myself so I'm not really complaining. It runs great now
Holy crap, don't ever go back there

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post #6 of 6 (permalink) Old 02-18-2017, 09:18 PM
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Quote:
Originally Posted by MLILLYBOOSTIN View Post
More like $780 lol. They spent 12 hours on it but only charged me for 4 hours. Plus part of my harness was melted so they fixed that, new spark plug cap, new carb and the Boyesen quick shot.

I would have never found the crack in the carb myself so I'm not really complaining. It runs great now
This is one of the miracles (on the customer's end) of Flatrate. The book says the carb clean, wire repair, and diagnosis fee should only take 4 hours. Even though they took 12 hours, they can only charge you 4 hours, and they lost out on 8 hours work for free so to speak.

I agree that's way too much, but if they were charging you the normal hourly rate, you'd be paying three times as much. Lol

2016 Yamaha YFZ450R SE
2007 Yamaha YFZ450 SE (SOLD!)
2002 Yamaha Raptor 660R SE
2003 Yamaha YZ250F
2006 Suzuki RMZ250
1993 Suzuki LT230E
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