Jump to content

Yamaha 450 2018 Issue

Recommended Posts

Having some issues with my 50 hour old 2018 YZ450F, the bike suddenly shut off while riding as if I ran out of gas (it was full) and won't start.
I have managed to start it two times but both times it shut off after a few seconds, while it was on it ran fine. 
The times it doesn't start it just clicks, aka it's not turning over the starter/engine at all. 
Battery reads 13.29V however when you press the start button it jumps to 0.0000V, shortage of some sort? 

I have checked the two 15 fuses close to the battery but I will check more thoroughly tomorrow, I have another battery I can try. 

Any help or tips are much appreciated. 

Share this post


Link to post
Share on other sites
Posted (edited)

The starter is what needs the voltage, check there

Edited by wetneck

Share this post


Link to post
Share on other sites

stock tank? I have had the starter wire from the relay to the starter rub a bare spot and will give the symptom you describe. But chances are that you have 2 separate problems. Starter wire won't cause a stalling issue

 

Share this post


Link to post
Share on other sites
Posted (edited)

Pull out plug, see if it spins normally.

I hear so many issues with the elec starts, batts, starters it makes me want to keep on kicking.

Brush recall, oil in starter...

Edited by wetneck
  • Like 1

Share this post


Link to post
Share on other sites

Update

I can get the bike started evertime (even with the old battery) if I turn the backwheel so the engine moves, if I don't do that it just clicks on the starter as if the top end is solid. It runs for longer now but sounds a bit weird (something I might not have noticed before since I rarely got it to start) My guess is that the decompression sensor is either faulty or something is wrong with the piston/top end. However I should get a fault code for the sensor and the engine shouldn't even start according to the manual.

Going to send a message to a few engine builders I know that might have experienced something like this before. 

Share this post


Link to post
Share on other sites
8 minutes ago, wetneck said:

Check oil filter

Decomp button hanging ?

Will do, didn't even know there were such a thing as a decomp button? 

Share this post


Link to post
Share on other sites

Finally found the issue and it's gonna be a costly fix. What was supposed to be a quick top end/cam chain swap turned into removal of the engine. 

Going to need at minimum new rod/rod bearings and main bearings. No idea how the hell they are shot in 50 hours, shit happens I guess. I do feel lucky at the moment that the rod never said peek-a-boo through the cases  

Going to call a few engine builders and ask what could cause this, if there is an underlying issue I need to find it.
Also going to take a chance and call Yamaha about it.

Share this post


Link to post
Share on other sites
8 hours ago, emlptr said:

Finally found the issue and it's gonna be a costly fix. What was supposed to be a quick top end/cam chain swap turned into removal of the engine. 

Going to need at minimum new rod/rod bearings and main bearings. No idea how the hell they are shot in 50 hours, shit happens I guess. I do feel lucky at the moment that the rod never said peek-a-boo through the cases  

Going to call a few engine builders and ask what could cause this, if there is an underlying issue I need to find it.
Also going to take a chance and call Yamaha about it.

I feel for you! I realize what I’m about to say isn’t going to help your current situation however a bottom end going out that early on a YZ450F isn’t normal. Lots of guys are getting 200+ hours on their bikes without any issues. I suggest there might have been something wrong from the factory. Perhaps you’ll discover more when you get in deeper. I agree that it’s good you caught this before the rod let go. Good luck with the project.

Share this post


Link to post
Share on other sites
8 hours ago, Into the sunset said:

I feel for you! I realize what I’m about to say isn’t going to help your current situation however a bottom end going out that early on a YZ450F isn’t normal. Lots of guys are getting 200+ hours on their bikes without any issues. I suggest there might have been something wrong from the factory. Perhaps you’ll discover more when you get in deeper. I agree that it’s good you caught this before the rod let go. Good luck with the project.

even in hard moto use?

Share this post


Link to post
Share on other sites

I would say anyone under a Pro level rider would easily get 150-200 hours on a bottom end. A National level rider should get 80-100 hours without issues. I did see Brett Metacalf hit the rev limiter several times a lap at my local track on a 450 but honestly who can ride at that level?

Share this post


Link to post
Share on other sites

Any chance the bike sucked in a lung full of water at some stage, no warning signs in previous oil changes ?? Odd for a bottom end to go so early. Keep us posted on the progress please.

Share this post


Link to post
Share on other sites
14 hours ago, Into the sunset said:

I feel for you! I realize what I’m about to say isn’t going to help your current situation however a bottom end going out that early on a YZ450F isn’t normal. Lots of guys are getting 200+ hours on their bikes without any issues. I suggest there might have been something wrong from the factory. Perhaps you’ll discover more when you get in deeper. I agree that it’s good you caught this before the rod let go. Good luck with the project.

I understand what you are trying to say and I agree, last 450 I had I sold after 212 hours without ever opening the bottom end. This shouldn't happen but it did, I have to wait and see what the engine builder says when he opens the engine. We have aweird holiday this week where I live so no one works more than 3 days, hopefully I will have it togheter before next weekend. 

Share this post


Link to post
Share on other sites
5 hours ago, ChampWazza said:

Any chance the bike sucked in a lung full of water at some stage, no warning signs in previous oil changes ?? Odd for a bottom end to go so early. Keep us posted on the progress please.

Not a chance lol! This bike has never seen a muddy track ? Will do, don't want this to happen to anyone else if there is something behind it causing this. I might as well just be out of luck.

4 hours ago, Autosport7 said:

Possible oil pump failure...?

Not sure! The engine isn't split yet (waiting on a time to drop it off at an engine builder) but while checking the rod it did pump up oil where it's supposed to, we'll know more when it's split. I will report everything here and on VitalMX. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:


×
×
  • Create New...