520 h with a tic

[fishingstararlake 1]

I have a 520 with the 20 hp onan that has a small tic around the carb.

the motor has just over 900 hours.

It still has plenty of power it does not do it at idle or at startup.

any help would be great

thanks

Dan

[Kelly 1,033]

:WRS: ik'm going to guess the valves need adjustment.

[AMC RULES 37,196]

:WRS:

You gotta maintain that Onan. :teasing-poke:

[BOWTIE 226]

HELLO, COULD IT BE A EXHAUST LEAK. ONCE IT HEATS UP THE METAL HEATS UP AND EXPANDS CAUSING THE LEAK/TICK. GOOD LUCK WITH IT.

BOWTIE IN OHIO

[fishingstararlake 1]

I didn't know about the valve adjustment.

I'm good with atvs, bikes and sleds.

how hard is it to the valves?

just in

could be a exhaust like bowtie said it started ticing in about 15 feet.

back to the valves

they need to be done. anybody have instructions on how to adjust the valves and what they should

be set at.

thanks

Dan

[sorekiwi 761]

anybody have instructions on how to adjust the valves and what they should

be set at.

The engine manual is here:

The valves are pretty easy to set once you get to them, they have a screw adjuster on them so you just do it like a normal automobile engine.

[woodchuckfarmer 333]

Go into files and down load the Onan manual

[fishingstararlake 1]

Talked to the local toro dealer and he said that it sounded like it is carbon.

He gave me some decarboning spary. Yesterday I tied it the tick stoped mowed my yard it never came back.

So yes I need to do the valves but was the cabon causing a hot spot or what?

What should the max rpm be?

Dan