2017 CRF450r died suddenly and won't start

hubbardmx50
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8/26/2023 4:04pm

Safe to say I'm super fucking annoyed. I've already missed two weeks of riding because of this BS. If anyone could point me in the right direction it would be appreciated. 

walent215
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8/26/2023 5:21pm

35 hours on what brand piston ? 
I’d pull the head as you mentioned and look at the piston and valve train 

 

hubbardmx50
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8/26/2023 5:32pm
walent215 wrote:

35 hours on what brand piston ? 
I’d pull the head as you mentioned and look at the piston and valve train 

 

Vertex......  Did I make a mistake?

Yeah I'm thinking I'll pull the head tonight and see what everything looks like in there. Gives me an excuse to use my badass cam chain tensioner tool. 

walent215
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8/26/2023 5:48pm
walent215 wrote:

35 hours on what brand piston ? 
I’d pull the head as you mentioned and look at the piston and valve train 

 

Vertex......  Did I make a mistake? Yeah I'm thinking I'll pull the head tonight and see what everything looks like in there. Gives me an excuse...

Vertex......  Did I make a mistake?

Yeah I'm thinking I'll pull the head tonight and see what everything looks like in there. Gives me an excuse to use my badass cam chain tensioner tool. 

Vertex is good but you never know what may have happened and the fact you have zero clearance on an intake would be good idea to take a peek inside . 

The Shop

hubbardmx50
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8/26/2023 6:06pm
walent215 wrote:

35 hours on what brand piston ? 
I’d pull the head as you mentioned and look at the piston and valve train 

 

Vertex......  Did I make a mistake? Yeah I'm thinking I'll pull the head tonight and see what everything looks like in there. Gives me an excuse...

Vertex......  Did I make a mistake?

Yeah I'm thinking I'll pull the head tonight and see what everything looks like in there. Gives me an excuse to use my badass cam chain tensioner tool. 

walent215 wrote:
Vertex is good but you never know what may have happened and the fact you have zero clearance on an intake would be good idea to...

Vertex is good but you never know what may have happened and the fact you have zero clearance on an intake would be good idea to take a peek inside . 

For sure. I definitely noticed a slight loss of power within the last month. Felt like I was riding the piss out of it and it's just wasn't as fast as it used to be 

hubbardmx50
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8/26/2023 8:42pm

Luckily had a perfect size shim laying around and was able get my left intake valve right in the middle of spec. And....... Still nothing 

 lol

Fuuuuuuuckkkkkkkkk

Really starting to hate dirtbikes right now 

PMR 3
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8/26/2023 9:24pm

I feel for you Moto Bro, maybe it's a sign. Time for a new Honey. 

1
hubbardmx50
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8/26/2023 9:50pm
PMR 3 wrote:

I feel for you Moto Bro, maybe it's a sign. Time for a new Honey. 

I was hoping to ride it until the end of the year. Theres definitely some good deals out there since the interest rates went up 

hubbardmx50
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8/29/2023 3:00pm

Pulled the flywheel and checked the woodruff key. Saw a video of a 2010 CRF that was popping when kicking over like mine is and the woodruff key was completely sheared. But, mine is totally fine. Anyone know what else I should look for? Still haven't pulled the head and looked at the piston. I'm already about $200 into this and pulling the head is another $40-50 in gaskets alone. Dumb question but, I haven't had any bike problems in a long time. Like I said earlier, when this all happened the bike bogged. If it were an engine problem would it bog or just totally stop? I haven't blown a bike up in over ten years. 

FGR01
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8/29/2023 3:11pm

I'd pull the valve cover and the spark plug and slowly crank the engine over.  Check the cam timing, cam chain, tensioner, etc.  Make sure nothing is obviously out of whack in the valve train.  Not really into it for any gaskets or money to do this.

Factor E
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8/29/2023 7:28pm

Need a Leak down test

Skerby
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8/30/2023 7:23am

I feel for you man. I bought a nos 2020 model a year ago and it occasionally just wont start, especially if you drive to a track thats far away. Then it just fires right up the next morning. Everything always checks out fine but the bike just wont fire sometimes. These have to be some of the worst bikes honda has ever built and will for sure be my last honda.

hubbardmx50
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8/30/2023 8:24am Edited Date/Time 8/30/2023 8:32am
Skerby wrote:
I feel for you man. I bought a nos 2020 model a year ago and it occasionally just wont start, especially if you drive to a...

I feel for you man. I bought a nos 2020 model a year ago and it occasionally just wont start, especially if you drive to a track thats far away. Then it just fires right up the next morning. Everything always checks out fine but the bike just wont fire sometimes. These have to be some of the worst bikes honda has ever built and will for sure be my last honda.

That's odd. This bike has 252 hours, never had a problem with it until now. I rode it almost every weekend for six years. I've already put too many hours into diagnosing it and I don't have any more tools to look at anything. I think I'm gonna take it to Twisted Development later this week. I never have other people work on my stuff but they have way more tools and knowledge than I do. Plus these honda test tools are crazy expensive and I don't think my next bike will be red anyways. I want something with a chassis that's more comfortable to ride on a rough track. 

1
hubbardmx50
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11/5/2023 2:53pm

IMG 4332 0.jpeg?VersionId=8P91mYIVPeU5IAIzbJGexrlwWell, two months, a new bike and a new job later I finally got around to deep diving this more. After testing every freaking connector on the bike I was starting to think it wasnt an electrical issue. Bought a leak down tester kit from Harbor Frieght and threw it on. Immediately showed 100% leakage and I'm guessing this is why..... This piston has less than 40 hours on it. WTF Vertex? 

4
PMR 3
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11/7/2023 8:19am

Crazy, the bright side you have a New Scooter. Hopefully it's Rad.

hubbardmx50
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11/7/2023 9:11am
PMR 3 wrote:

Crazy, the bright side you have a New Scooter. Hopefully it's Rad.

This 17 was a great bike. Excited to freshen it up and bring it back to life so my dad can ride it. OEM parts should be here tomorrow. I'm on a 2023 KX450 now and absolutely loving it. Such a comfortable and fun bike. 

1
hubbardmx50
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11/7/2023 9:15am

I also have a 2015 CRF450r for sale if anyone is interested. 

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