Did one moto at LACR yesterday, bike bogged at the top of the hill just as if you forgot to turn your gas on on a two stroke. I coasted down the hill and tried to bump start it twice with no luck. Got back to the pits and kicked it (yes this was the last year before e-start) for awhile and nothing. I unplugged the kill switch, nothing. Bike isn't locked up which is good and turns over fine. It has ran great every weekend recently just like it always has for six years. Top end has about 35 hours. Replaced the fuel filter about four rides ago. Checked valves a few weeks ago and noticed left intake was a bit tight and right intake was a bit loose which was weird. They were still within spec and I don't think that would cause the issue I'm experiencing. Haven't had a chance to tear into it but I guess I'll start with checking spark. If you guys have any ideas please let me know. Thanks
Battery-Fuel pump-Plug-Electrical
There is no battery. Just checked the plug and I have spark.
Fuel pump is good. Just tested it. Don't have an actual test kit to see pressure but it's definitely turning on. Also drained my oil and checked oil filter. Both looked great. All connectors to the throttle body are clean and plugged in. Kill switch isn't throwing any codes.
Anyone know what else I can check?
2017 owner as well. Sounds like a kill switch issue, which is fairly common on Hondas.
Without getting into it I recommend googling and reading. Could just be a bad ground.
I would start with unplugging the switch and see what happens.
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I did. I'm aware of the killswitch problem so that was my first thought. Still wouldn't start
Sorry, re-read and literally the first thing you did - lol
I’m sure you checked that ecu connection is good.
Might want to check the injector, could add a little gas through the intake of the throttle body just to see if it try’s to start. Check for dirt in the air intake while your there, give you an idea if dirt could have possibly got in there.
next up I would check cam timing. Auto tensioner on these can be a weak spot, not sure if you replaced during top end.
Hopefully it’s something simple 👍
No worries. Gonna borrow a fuel pressure test kit and try that. If that checks out I think I'll try some starting fluid. I don't know why I didn't try that before taking it apart
A friend has had similar trouble and had to replace his Fuel Pump twice in 4 years.
I'm honestly hoping that's what it is. So his bike wouldn't start either?
Yes wouldn't start, kinda out of the blue. Then it started once out of 10 tries when we arrived home?
Oh ok. Yeah mine won't start at all. I am hopefully going to borrow a very nice pressure test gauge so I'll let you know what I find. I'm almost tempted to buy the all balls rebuild kit for $74 and see what happens but we'll try this pressure tester first.
If your bike suddenly bogs to a stand still like it's out of gas, odds are it's your fuel pump. Here's a video on how to replace it... quick and easy!
https://youtu.be/I3YH8HX7o3Y
Hope this help you get back to the track! We ride LACR all the time!
Flow Moto
Tried to post this last night but the vital server must have fouled a plug or something....
Hooked up my buddie's sweet fuel pressure test kit and a 12v battery to my fuel pump and it kicked back 0 PSI
I think I know what the problem is
That was easy....
I knew my bike felt funny the last couple times I rode. It just didn't have that same snap out of corners that it used to. I was thinking it was my clutch or my valves. Threw a new clutch in and my valves are in spec. Bike should run great with new pump. Excited to ride
Nice video. I mainly stick to Elsinore and GH but we really like LACR so we may head back up this weekend if it's not flooded. I hope they post am update soon. Dirt should be sweet. If I see you at the track I'll come say hello. My fuel pump lasted six years and 252 hours of ride time, so I guess I can't complain. It's hard to beat Honda.
Well, installed the all balls fuel pump kit and a new spark plug and my bike still won't start. I'm pretty lost
Disconnect tip over and reconnect Had a bike ride the whole way to LL and not start when getting there after disconnecting reconnecting it fired up
So, super weird deal. Tested the old actual pump (the little battery looking thing) and it pumped insane pressure. Took the entire assembly apart, reassembled everything and kicked 50PSI like it's supposed to with the all balls pump. Mounted everything back to the tank on the bike, nothing. WTF. Maybe it's not the fuel pump? I'm so lost. Should I replace my injector? Rest of the wiring assembly looks good. Haven't torn the motor apart but it turns over like I said and oil looked great. My left intake valve is really tight. When I have some time I'm gonna see what shim is in there and adjust it. But I don't think that would cause bike to not start. I also tried starting fluid and it did nothing. I'm pissed. I fucking hate bike problems. This thing has been incredibly reliable and now I wanna throw this motherfucker off a cliff.
Dang it! Hang in there Moto Bro!
Pit Row
If u can bump start your bike then get your left valve adjusted
Tried to bump start it at the track the day it died since I rolled down a big hill anyways but nothing. Haven't tried since
Leak down test
Never done that. Don't have the tools.
Also noticed something feels a bit odd when kicking the bike over. Almost as if something is binding. I think I may pull the head and cylinder tonight and see what the top end looks like and shim that valve while I'm in there. Can anyone think of anything else I should look at? Is there any way to test a condenser? Just thinking of possible culprits.
Does it have a tip over sensor? I don't know alot about newer Honda's but I have seen those things do goofy stuff before.
I'm not sure honestly.
Disconnect what?
Almost positive R models don’t have tip over sensors like the L models. Still, might be worth looking for on motosports (or your preferred) OEM parts Fische.
Bummed that a new fuel pump didn’t fix it
Hate trying to trouble shoot things remotely but - fuel pump and kill switch can be crossed off the list and from the symptoms you’ve described regarding left intake valve and weird feel while kicking, I would move on to checking the cam timing and that the decompression plunger is functioning properly. I had the actuating pin fail on an older CRF model. It’s worth checking.
When the bike bogged out where in the rpm range were you ? and when you tried bump starting did the back wheel lock up, back fire, or ?
When the bike bogged I had just doubled up a triple step up and was rolling up to the top of the hill where you'd land if you jumped the whole thing. I was in really low RPMs. Cam and crank are timed perfectly. I didn't look at the automatic decompressor if that's what you're referring to. Just pulled my injector out and noticed there was gas on top of it. So now I know fuel making to the injector but may not be spraying through. Gonna hook it up to a battery and see if it sprays.
Update, injector working perfect.
At this point it's really not looking like it's electrical. Killswitch, Condenser, coil, fuel pump, injector and everything else powered by the wire harness seems to be working fine. I don't know what else to look for. I guess next step would be to pull the head and see what the piston and rings look like(?)
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