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Discussion Starter #1
Hi all, any and all thoughts appreciated!
Ok for starts 2020 Grom, Chimera Intake, Zoom exhaust...just installed Tb Cam and Dh ECU and bike won't fire up.
Starter just whirrrs around, Timing is correct .003 in .003 ex. Batter is good, placed on a tender to charge as precaution...still no luck. Everything appears to be seated correctly no loose wires etc... Already sent ECU back to David and he resent back, any ideas?
 

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When you say the starter just whirs around, is is just starter motor noise, and no engine cycling?

Did you happen to remove the stator cover and forgot to reinstall starter gear?
 

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Discussion Starter #4
Thanks for reply...gear is in place didnt mess with stator cover. Engine is cycling. Checked for spark...good, fuel pump primes, after putting my finger on spark hole I got no air..compression?
Did a bump start and nothing still wouldn't fire.
 

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So no compression? Would that mean when you changed the cam you got something wrong and the valves are not closing at the correct time?
 

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So no compression? Would that mean when you changed the cam you got something wrong and the valves are not closing at the correct time?
Three things that can go wrong,
first is you removed the timing chain or replaced the cam the timing might be 180 out, make sure the timing mark on the chain sprocket and the timing mark on the flywheel matches up or the cam sprocket indent tooth causing the sprocket to spin or move out of timing, always make sure to torque down the cam chain sprocket and use blue loctite.

Second if no compression I would say either you got a hole in your piston, or your valves need lapping or your piston compression rings are shot.

third your start switch might be fakely on the right handle bar

Good luck
 

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Hi all, any and all thoughts appreciated!
Ok for starts 2020 Grom, Chimera Intake, Zoom exhaust...just installed Tb Cam and Dh ECU and bike won't fire up.
Starter just whirrrs around, Timing is correct .003 in .003 ex. Batter is good, placed on a tender to charge as precaution...still no luck. Everything appears to be seated correctly no loose wires etc... Already sent ECU back to David and he resent back, any ideas?
This sounds like the valve timing is out and hopefully did not bend any valves,make sure cam gear on properly and correct crankshaft/camshaft marks in proper location.Mikez
 
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