2018crf450r update:

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Tooner
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2018crf450r update:

Post by Tooner » Thu Nov 30, 2017 2:09 pm

Dropped the bike off at DFW Honda yesterday afternoon. This morning a about 5:30 I figured out what happened. That is the good news and the short conclusion is it was not a manufacture issue. It was my F$$$ up!

After a lot of thought about how the decompression system could have come dismantled without any of the individual pieces being damaged I believe that the right cam bearing was just to the right of the set ring that would have held it in place. The bearing worked its way to the end of the cam, journal and cam cap. This allowed the set pin located under the bearing to come out due to centrifugal force of the spinning cam. This allowed the decompression weight to march ahead of the bearing and free the decompression plunger. When the bearing off, the metal beat down began and I hit the stop button. Just my theory at this point, we will see what the professional says.....
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r

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dufremle
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Re: 2018crf450r update:

Post by dufremle » Thu Nov 30, 2017 3:11 pm

What did you do to cause the issue?
Jim

2024 Subaru Crosstrek
2017 Toyota 4Runner

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Tooner
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Re: 2018crf450r update:

Post by Tooner » Thu Nov 30, 2017 3:51 pm

dufremle wrote:What did you do to cause the issue?
In retrospect, I should have placed the set rings directly on the bearings rather than placing them in the channels in the cam cap that I then placed on top of the bearings. I believe this is what allowed the right cam bearing to slide to the right by about 3-4mm when I placed the cam cap with bearing not engaging with the set ring that would have held it in place. So other than the 11 ft.lbs of torque I put on the cam cap bolts, there was nothing to keep the bearing from working its way off the end of the cam. When the bearing slide off it uncovered the decompression weight set pin which took a trip to the exhaust side of the head and freed the decompression weight to slide out of the cam, which released the plunger to go play with the stator at the bottom of the timing chain well. None of these parts was damaged, in fact, I was able to reassemble all of them and only realized that there is now a bigger issue ie. bent valve or something that wouldn't let me hand crank the motor after reassembly.
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r

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Re: 2018crf450r update:

Post by WickerMan » Fri Dec 01, 2017 10:28 am

Tooner wrote:
dufremle wrote:What did you do to cause the issue?
In retrospect, I should have placed the set rings directly on the bearings rather than placing them in the channels in the cam cap that I then placed on top of the bearings. I believe this is what allowed the right cam bearing to slide to the right by about 3-4mm when I placed the cam cap with bearing not engaging with the set ring that would have held it in place. So other than the 11 ft.lbs of torque I put on the cam cap bolts, there was nothing to keep the bearing from working its way off the end of the cam. When the bearing slide off it uncovered the decompression weight set pin which took a trip to the exhaust side of the head and freed the decompression weight to slide out of the cam, which released the plunger to go play with the stator at the bottom of the timing chain well. None of these parts was damaged, in fact, I was able to reassemble all of them and only realized that there is now a bigger issue ie. bent valve or something that wouldn't let me hand crank the motor after reassembly.
At least you know what you are doing now, and know engines well enough to figure it out. I'm not sure what some of those words even are. If you need help I can move stuff, or drop a bolt in the lower case, whatever you need
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Re: 2018crf450r update:

Post by Tooner » Fri Dec 01, 2017 2:16 pm

Thanks Matt at this point I just need a Beer.
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r

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Re: 2018crf450r update:

Post by Sconway » Sat Dec 02, 2017 10:01 am

Sounds like a learning experience. We have all been there. I once tangled my cars wiring harness around a drill bit while drilling a hole through the fire wall. So many little wires shredded.


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Re: 2018crf450r update:

Post by Tooner » Sat Dec 09, 2017 6:03 am

Mechanic said that it looks like the cam is out of true (bent) and the right intake rocker arm is also bent. He says to keep the head and replace the camshaft assembly. $1200, most of which is labor costs.
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r

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Re: 2018crf450r update:

Post by dufremle » Sat Dec 09, 2017 7:48 am

At least the motor wasn't destroyed
Jim

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Re: 2018crf450r update:

Post by Tooner » Sat Dec 09, 2017 8:00 am

dufremle wrote:At least the motor wasn't destroyed
for sure, it could have been much worse.
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r