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CA
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foreman52
5/29/2018 12:24pm
5/29/2018 12:24pm
Edited Date/Time
1/14/2019 8:55am
Hi all,
I have a 2018 YZ450F, approx 6-7 hours on it. Replaced the clutch after my last ride out...felt like it was slipping. Put a new one in it today and didn't solve the problem (original clutch still fine). It's very evident that when in third gear and get on the throttle it skips. All other gears are fine.
I'm wondering if anyone has had this issue yet. I have seen lots of starter problems but no transmission issues. I race as a regional pro here in Canada so I am not just some random Joe Blow LOL. I run the bike high sticking between third and fourth 95% of the time.
Thanks for any help you contribute
I have a 2018 YZ450F, approx 6-7 hours on it. Replaced the clutch after my last ride out...felt like it was slipping. Put a new one in it today and didn't solve the problem (original clutch still fine). It's very evident that when in third gear and get on the throttle it skips. All other gears are fine.
I'm wondering if anyone has had this issue yet. I have seen lots of starter problems but no transmission issues. I race as a regional pro here in Canada so I am not just some random Joe Blow LOL. I run the bike high sticking between third and fourth 95% of the time.
Thanks for any help you contribute
Paw Paw
The Shop
Once you shift into third gear and get on the gas hard it slips. It feels as if something is not catching. I'm pretty positive this is a transmission issue, but I just wanted to see if anyone has had this issue yet.
I wouldn't say it's exactly like "hitting false neutral" because when that happens we almost go over the bars, but it's certainly a feeling like that. It looses power when hitting a high RPM and than it corrects itself and you almost whisky throttle over backwards because all of a sudden the power hits of all at once
Also maxima and amsoil full synthetic dirtbike oil is the only one that prevents slipping - in my experience.
Also, I suggest buying a magnetic drain plug. All three times my YZ tranny went out there was not a lot of stuff on the magnetic drain plug, but there was more than usual. Or, you could filter the oil through cheese cloth and see what you get. Maybe you're doing these things already and I'm just not able to parse it out of your posts, but those are a couple of suggestions.
Kb is right about third gear too. That's where my YZ 250 makes the most power, and it has always been the gear the dogs round off on. I don't know about the four strokes, but it takes hardly any wear on my smoker's 3rd gear dogs for it to start jumping into a false neutral. In fact, the first time I took it apart I looked at them and thought they were fine. Put it back together and the same problem immediately (that was a painful lesson for sure). Anyhow, once I got the new third gear and saw the difference in the dog ears it was noticeable, but still not very much had worn. Like I said, it doesn't take much. Good luck to you, motobro.
Pit Row
Sounds electrical but I have never see a CDI controle unit go bad it is typically something feeding it the info that goes bad.
What have they tried from the simple end? Check all connections and Electrical grease in all connections? Would assume Spark plug has been tried? Spark plug cap? Thermo unit? Neutral switch Assembly? Engine controle unit?
I would get the bike back and find someone that has the 18 and swap out the parts till you find the culprit
What rpm range is it breaking down?
Get it home while it's raining of course so pavement is wet. Here is an idea of what it's doing. I wish I could get a video opening it up more. You can hear/see as soon as I get on the throttle hard it "skips".
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