NAA Won't Start

phil(va) · May 4, 2019

Been using it all spring for bush hogging. Shedded. 6volt. Always has 40 lbs oil pressure, no smoke anywhere. About a week went by, went
to start it, cranked over ok, got 'pfffft' then nothing else. Still cranks over ok. checked spark, got spark at all plugs, replaced
plugs (needed it anyway), no fuel on plugs. Pulled carb and cleaned it and put it back, same thing. Not my first go-round with M-S
carbs. I'm familiar with them. Charged battery. Ordered carb kit, pulled carb again, cleaned it again, put in kit, reinstalled, same
thing. If I choke it and then unchoke i get that pfffft one time. Sometimes a little gas will shoot out intake, not much, but has new
needle and seat. Thinking it has to be compression, but engine has 203 hours on full overhaul by pro.
Suggestions?

Royse · May 4, 2019

It's free to check the compression. While at it, I would check the
static timing. I find it unlikely your carb went bad in a week.
And since you've already tried it without positive results, I doubt
it is the cause of your problem.

pinball · May 4, 2019

it almost sounds like your not getting any gas to your carb. I would pull the plug from your carb to make sure your fuel is flowing okay.

phil(va) · May 4, 2019

Yeah I pulled the plug on carb and gas flows and keeps flowing. I've pulled and cleaned carb three times now. Same result.

phil(va) · May 4, 2019

I put my hand over carb intake and seems like real good suction. It's hard to know how good is ok, but it seems strong.

phil(va) · May 4, 2019

Hadn't thought of timing. Not sure how it would get off just sitting, but something to check.

showcrop · May 4, 2019

(quoted from post at 13:24:02 05/04/19) Been using it all spring for bush hogging. Shedded. 6volt. Always has 40 lbs oil pressure, no smoke anywhere. About a week went by, went
to start it, cranked over ok, got 'pfffft' then nothing else. Still cranks over ok. checked spark, got spark at all plugs, replaced
plugs (needed it anyway), no fuel on plugs. Pulled carb and cleaned it and put it back, same thing. Not my first go-round with M-S
carbs. I'm familiar with them. Charged battery. Ordered carb kit, pulled carb again, cleaned it again, put in kit, reinstalled, same
thing. If I choke it and then unchoke i get that pfffft one time. Sometimes a little gas will shoot out intake, not much, but has new
needle and seat. Thinking it has to be compression, but engine has 203 hours on full overhaul by pro.
Suggestions?

Are you getting gas to the cylinders?

phil(va) · May 4, 2019

No. Plugs are dry.

Royse · May 4, 2019

"No. Plugs are dry."

They should be. Unless it's flooded.
The timing wouldn't just get off while setting, but I have seen the
shear pin in the distributor shaft or the gear itself break while
attempting to start an engine. Both with tractors and cars/trucks.
Might not be it at all, but as I said, free to check and rule it out.

showcrop · May 4, 2019

(quoted from post at 18:29:04 05/04/19) No. Plugs are dry.

It won't run unless it is getting gas to the cylinders. Having spark but no fire, the plugs should be wet unless the gas is not getting to the cylinders. You need to choke it more.

da.bees · May 4, 2019

Why not give it some starting fluid while it's turning over? If it doesn't hit on starting fluid,the problem isn't lack of fuel. If it try's to start on starting fluid,you should look at fuel again.

Jim L WA · May 5, 2019

Are there any kids around that could have messed with it? Check the firing order, 1,2,4,3. CCW I think. You may have to pull the cap and crank it to make sure.

NAA Won't Start

phil(va)

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Royse

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pinball

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phil(va)

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phil(va)

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phil(va)

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showcrop

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phil(va)

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Royse

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showcrop

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da.bees

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Jim L WA

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