2018crf450r update:
2018crf450r update:
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.....
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
Current ride and track: 2009 CBR 1000rr
2018 crf450r
- dufremle
- Club Staff/Treasurer
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Re: 2018crf450r update:
What did you do to cause the issue?
Jim
2024 Subaru Crosstrek
2017 Toyota 4Runner
2024 Subaru Crosstrek
2017 Toyota 4Runner
Re: 2018crf450r update:
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.dufremle wrote:What did you do to cause the issue?
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r
Current ride and track: 2009 CBR 1000rr
2018 crf450r
- WickerMan
- Posts: 538
- Joined: Tue May 28, 2013 10:17 am
- Riding Style: Novice Track Rider
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- Location: DWG
Re: 2018crf450r update:
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 needTooner wrote: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.dufremle wrote:What did you do to cause the issue?
What is up with this space?
2015 ZX-6R 30th Anniversary
2014 CBR500R HRC
2007 Ruckus winter camo
2015 ZX-6R 30th Anniversary
2014 CBR500R HRC
2007 Ruckus winter camo
Re: 2018crf450r update:
Thanks Matt at this point I just need a Beer.
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r
Current ride and track: 2009 CBR 1000rr
2018 crf450r
Re: 2018crf450r update:
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.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
2015 Suzuki GSX-R750
2006 CBR 600RR #803
2019 Ohvale GP-0 190
2006 CBR 600RR #803
2019 Ohvale GP-0 190
Re: 2018crf450r update:
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
Current ride and track: 2009 CBR 1000rr
2018 crf450r
- dufremle
- Club Staff/Treasurer
- Posts: 12567
- Joined: Fri Aug 25, 2006 7:57 am
- Riding Style: Novice Track Rider
- Achievement count: 0
- Location: NW Fort Worth
- Contact:
Re: 2018crf450r update:
At least the motor wasn't destroyed
Jim
2024 Subaru Crosstrek
2017 Toyota 4Runner
2024 Subaru Crosstrek
2017 Toyota 4Runner
Re: 2018crf450r update:
for sure, it could have been much worse.dufremle wrote:At least the motor wasn't destroyed
Shane
Current ride and track: 2009 CBR 1000rr
2018 crf450r
Current ride and track: 2009 CBR 1000rr
2018 crf450r
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