2012 RM-z450 won’t start after cold start

tntm7le
Posts
7
Joined
1/15/2021
Location
Georgetown, CA US
Have 2012 it starts decent cold but if you stall it warm it won’t re start.
Bike has complete new engine with less then 10hrs. Leak down is 18%, kicking compression is 78psi, cam timing is good per degree wheel as well as timing marks.
Bike has new wiring harness, new injector, new stator, new Ecu, new coolant temp sensor, new tip over sensor.
Start bike cold run full moto runs perfect, shit it off and it’s game over. It won’t push start, kick start. Let it sit and hour and it fires right up.
Start it cold shut it off, it start again and after it has run 3-5 min it’s really hard to start after 10 min it has to sit 10-15 min before it start again??
This bike has kicked my ass all over the place.
I’m at a total loss.
Also, suzuki SDS shows no fault codes, even after warm when bike won’t start.
I’m all ears to anyone who got a finger to point.
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tntm7le
Posts
7
Joined
1/15/2021
Location
Georgetown, CA US
1/16/2021 10:02pm
Sure sounds like a leaking injector to me.

Paw Paw
If it was leaking injector new injector should have solved the issue. Besides it doesn’t have wet spark plug on hot restart it’s dry.
tntm7le
Posts
7
Joined
1/15/2021
Location
Georgetown, CA US
1/16/2021 10:07pm
It really seems like it’s not getting fuel on hot restart.
Factor E
Posts
734
Joined
9/22/2011
Location
So Cal, CA US
1/17/2021 12:19am
If the old wire harness is good put it back on and run it
Sound like heat is the issue, poss electrical
1

The Shop

kb228
Posts
6161
Joined
1/31/2018
Location
Mansfield, OH US
1/17/2021 3:08pm
Coolant temp sensor
1/18/2021 6:51am
I would try the things mentioned above but also add that a slightly tight valve spec. I also had a flywheel go bad on one of these bikes that made it do weird things.
1/18/2021 7:01am Edited Date/Time 1/18/2021 7:02am
Factor E wrote:
If the old wire harness is good put it back on and run it
Sound like heat is the issue, poss electrical
I'd also go along with this train of thought. I had an old cycle that when it was cold, started normally. Ride it around town and shut it off, you're stuck until it cools off. That one was and electrical issue in the stator once it was hot.

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