GX 630 Stumbling at Trigger Pull

814jeffw

814jeffw

Active member
I bought a GX 630 Honda this past Winter and have been using it without issue. Today, started up just fine, ran for about a minute before pulling the trigger,..when I did,..it stumbled and shut off. Started back up and did the same thing. Never did that before. Throttle was just a bump over halfway. Pump is a TSF2021.

So we bumped the throttle up to about 3/4 and then it would work and run fine under load. But, still,..even as of just now,..it still wants to stumble ever so slightly at the initial pull of the trigger,..but is fine at full throttle,..no stumble. This engine has just shy of 200 hours on it and alot of those hours were run at half throttle. I like the full flow of the TSF2021 for decks and concrete and wetting plants during roof cleaning,..but houses, I throttle back,..unless it's a giant house or building, then we throttle up.

Thought maybe running it at lower speed maybe messed the plugs up,..but they look good to me. Probably gonna change them anyhow though. Fuel filter is 3/4 full also. Also gonna put some dry gas in the tank.
Used it yesterday and it didn't stumble, not even at half throttle. Then today it started. Never did it till today. It's not that bad and runs fine once it gets past the slight stumble,..pressure is steady and runs and sounds good. Just wondering if anyone can point me in the right direction with this particular problem or if these engines are "known" for this after so m any hours or whatever??

Any help appreciated!!

Thanks,
Jeff
 
Is the fuel tank below the engine? I think it is better for these small engines to always run it top speed and turn down the unloader to cut flow.
 
My Honda was acting up, harder to start than normal and just not running like it normal did. Check everything and could not find a problem.
Decided to change the spark plugs (even though they were replace in Feb.) the engine starts and runs like it always has.
So I would say try a new set of plugs!
 
I agree with Tom, these engines are made to run at whatever operating RPM.

Motor may of bogged because of load from pump hitting low RPM, low torque motor speed. I would run some 93 octane in the next tank to be on the safe side. If you're not running it everyday get some fuel stabilizer in the tank.

If you want to lower psi, switch to larger nozzle sizes.....leave the throttle & unloader alone.

Honda's are bullet proof.
 
Thanks for the input guys.

@Tom,... Yes, the fuel tank is mounted underneath the engine. I kinda' always heard it's better to run small engines at full throttle,..but never heard anything conclusive either way.

@Chad,..Didn't know that about the fuel solenoids,..thanks for the info!

@ Mike,...I am planning on changing plugs as well. I hope it also solves my problem.

Thanks Again,
Jeff
 
Thanks Guy,.. You were typing when I was,.... Anyhow,..I do run 93 gas all the time,.. Although I was trying to cut flow,.. I agree with you about the larger nozzles,..and I may have to change my methods some. I just like the calm sound of half throttle,Ha,Ha,..

Thanks Again,
Jeff
 
The vacuum operated fuel pump can not lift fuel very high, could be starving it a little. If you have the clear fuel filter you can look to see if its not getting much gas, I think the filter should always have some gas in it. No need to be afraid of the unloader, if you have a pressure gauge mounted.
 
On a side note,..regarding fuel additives,...Are these new Honda engines more ethanol resistant than older engines? And if anyone uses stabilizers or additives,..are there any in particular that are made more for small engines?

Thank You,
Jeff
 
814jeffw said:
On a side note,..regarding fuel additives,...Are these new Honda engines more ethanol resistant than older engines? And if anyone uses stabilizers or additives,..are there any in particular that are made more for small engines?

Thank You,
Jeff
Click to expand...

Sea Foam will work. You can find it at Advance auto etc
 
Startron additive highly recommended by my local shop.
814jeffw said:
On a side note,..regarding fuel additives,...Are these new Honda engines more ethanol resistant than older engines? And if anyone uses stabilizers or additives,..are there any in particular that are made more for small engines?

Thank You,
Jeff
Click to expand...
 
Guy Blackmon said:
I agree with Tom, these engines are made to run at whatever operating RPM.

Motor may of bogged because of load from pump hitting low RPM, low torque motor speed. I would run some 93 octane in the next tank to be on the safe side. If you're not running it everyday get some fuel stabilizer in the tank.

If you want to lower psi, switch to larger nozzle sizes.....leave the throttle & unloader alone.

Honda's are bullet proof.
Click to expand...
They are designed to run @3600 rpm.
 
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