Posts
7
Joined
4/12/2020
Location
Hampstead, NC, USA
Alright, I'm going for the HAIL MARY to see if you all can help me this narrow this down because this bike still isn't running!
Forgive the length of the post, but I wanted to try and make sure I laid everything out as to the current situation.
What it's doing now:
- It will turn over 3-4 cranks sometimes when I give it gas but it won't keep running, only a couple seconds. If I don't give it gas, it will just sputter every 3-4 cranks.
Whats been done: Written on the picture along with pics of the Cams and Piston at TDC.
- I bought both the GYTR Tuner and set the bike to factory settings (Which I'm pretty sure thats what it was on).
- FI diagnostic tool to test everything its capable of (everything fell within spec)
- tested the spark and it wasn't sparking every crank, but did the diagnostic and had a steady spark so that ruled out the stator and the magneto.
- Tested the entire electrical circuit and everything fell within spec.
- It has compression (130 was the reading),
- Didn't conduct a leak down test (just got thr kit in the mail yesterday)
- brand new air filter,
- New iridium spark plug (CR7EIX) I know OEM is CR8 but the guy who built and sold me the bike told me he ran the cr7.
- fuel is 116 Octane / 93 mixed,
- used a fuel cleaner,
- New fuel injector,
- New fuel pump,
- adjusted the intake/exhaust cam shaft and ensured the valves were within specs (either OEM or Hot Cams) and they fell within those numbers (Cams and Piston at TDC)
- bottomed out the idle/primer (did that many, many times) knob and kicked it, kicked it, and kicked it plenty of times after that every couple of clicks until it bottomed out in the other direction
So between myself and this guy my buddy introduced me too, who has never worked on a bike like this (but has been working on dirtbikes and motorcycles for 50 years). who was very impressed with how these bikes are built. This is what we have narrowed it down too.
What we have narrowed it down to:
1. ECU (ordered)
2. Throttle Position Sensor (reading from tuner was off the Degrees and doesn't seem to want to stay) (Ordered)
3. Fuel pressure sensor (ordered)
4. Regulator/rectifier (entire circuit cannot be completely tested because of the way it's built, but what we could test was within spec)
5. Air Intake pressure sensor (Ordered)
If anyone has any other ideas please send it this way! Thank you in advance
Forgive the length of the post, but I wanted to try and make sure I laid everything out as to the current situation.
What it's doing now:
- It will turn over 3-4 cranks sometimes when I give it gas but it won't keep running, only a couple seconds. If I don't give it gas, it will just sputter every 3-4 cranks.
Whats been done: Written on the picture along with pics of the Cams and Piston at TDC.
- I bought both the GYTR Tuner and set the bike to factory settings (Which I'm pretty sure thats what it was on).
- FI diagnostic tool to test everything its capable of (everything fell within spec)
- tested the spark and it wasn't sparking every crank, but did the diagnostic and had a steady spark so that ruled out the stator and the magneto.
- Tested the entire electrical circuit and everything fell within spec.
- It has compression (130 was the reading),
- Didn't conduct a leak down test (just got thr kit in the mail yesterday)
- brand new air filter,
- New iridium spark plug (CR7EIX) I know OEM is CR8 but the guy who built and sold me the bike told me he ran the cr7.
- fuel is 116 Octane / 93 mixed,
- used a fuel cleaner,
- New fuel injector,
- New fuel pump,
- adjusted the intake/exhaust cam shaft and ensured the valves were within specs (either OEM or Hot Cams) and they fell within those numbers (Cams and Piston at TDC)
- bottomed out the idle/primer (did that many, many times) knob and kicked it, kicked it, and kicked it plenty of times after that every couple of clicks until it bottomed out in the other direction
So between myself and this guy my buddy introduced me too, who has never worked on a bike like this (but has been working on dirtbikes and motorcycles for 50 years). who was very impressed with how these bikes are built. This is what we have narrowed it down too.
What we have narrowed it down to:
1. ECU (ordered)
2. Throttle Position Sensor (reading from tuner was off the Degrees and doesn't seem to want to stay) (Ordered)
3. Fuel pressure sensor (ordered)
4. Regulator/rectifier (entire circuit cannot be completely tested because of the way it's built, but what we could test was within spec)
5. Air Intake pressure sensor (Ordered)
If anyone has any other ideas please send it this way! Thank you in advance
I had that same yz450, only problems I ever had were the fuel pump getting trashed by the ethanol fuel I used to use, and the injector I believe, but when I had that problem I replaced the entire throttle body, so it could have been something else in that assembly. Other than that, I’d say make sure all connections are good, they can get corroded or loosen up after a single year, let alone 9. It’s a solid bike though, I loved mine enough that I rode it for 5 years, never had a single engine problem.
Actually, I also heard of some having problems with the fuel line collapsing internally, couldn’t tell by just looking at it, but the rubber inside swelled up, I’d start with that.
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