top end timing,yamaha 80

[one eye]

Can anybody help with a timing issue please?

My manual says to move the arm to the full open position to check the timing.

It does not mention if it should be in gear? although i guess it should be!

It does not mention what rpm it should be doing,(if i just move the arm manually to the full stop position its not on full rpm as one arm stops on timing and the other will carry on past as the throttle is opend.

I intend to put the boat in the water with trailer attatched to test the timing on top end (strapped to the trailer of cause, and still attached to the car).

can anybody tell me the correct method and rpm please?

Thanks Jim

[fast fred]

in gear, with test wheel, at 5000 rpms , 20deg BTDC, check TDC to zero first.

[one eye]

Thanks fred

Is it possible to do without timing wheel, just using standard prop?

[one eye]

Also my manual states 22 BTDC +/-1, are you saying it should be 20?

Regards Jim

[fast fred]

my book is sayin 20 deg +/- 1, it's not the best idea, but , i have done it with a prop. run two ropes from the back of the trailer to the bow eye, strap the transom down, cranked right up to the post. back in till the cave plate is in,
still all strapped down , fire it up, trim up a bit so she's throughin a tail,make a pull, ckeck it at 5000rpms, i'd hit at 21, thinkin your rev limited. be careful, ya don't want it in your tow rig watch your water pee toob .

or have a friend drive, on a flat day.

[one eye]

Thanks fred ill try that.

Regards jim

[kergoat]

you can check the timing without need to start your motor !
move manually the arm that control timing to the full open position to check the timing use crank motor to rotate motor but not starting it (remove spark and ground term cap) . check timing with timing belt

safer for motor it s not recomanded to test max rpm without charge (test tank water) on propeller

excuse my english i m french

[kergoat]

normaly you must check / adjust idle timing motor in gear slow forward speed you book doesnt give some value ? .
and after adjust max timing 22 +/1

[one eye]

My motor does not have a timing belt!

As far as i can see it is imposible to set static timing on this model!

Moving the timing/throtle arm on static does not move any visual timing.

PLease correct me if im wrong! but i dont think so.

[Nos4r2]

No insult intended here, but if you've got a manual and you can't do it then pay someone or you'll break it.