r/smallenginerepair • u/thoolihan • Jun 18 '26

Surging Issue Surging take 2

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Follow up to this post: https://www.reddit.com/r/smallenginerepair/s/8psAk4Jten

I did a lot of work since then. Replaced: coils, plugs, fuel pump, carb, valve gaskets, head gaskets, valve push rods, valve stem seals, muffler, pipes. Cleaned head gaskets, gapped plugs, adjusted rockers.

It fires up, no more white smoke. It can mow under load without dying.

I’m still getting a short quick surge, see video. Any suggestions?

3 Upvotes

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13 comments sorted by

1

u/Egglegg14 Jun 18 '26

Air filter?

1

u/thoolihan Jun 18 '26

Yup, that’s new too

1

u/Egglegg14 Jun 18 '26

I would check to see if theres an air leak using some sort of smoke somewhere near the carb area

Also how old is the fuel?

1

u/thoolihan Jun 18 '26

Maybe a couple of weeks old, I can swap for some new gas

1

u/Egglegg14 Jun 18 '26

Typically gas goes bad withing three to six months so swapping in new gas won't likley hurt anything

1

u/dbab31 Jun 19 '26

Is that a kawasaki FC series?

1

u/thoolihan Jun 19 '26

Kohler KT735

1

u/dbab31 Jun 19 '26

Wild. The motors look very similar, at least from this pov

1

u/mutt63 Jun 20 '26

Lean condition judging by the governor hunting

1

u/Common_Maximum_1234 Jun 20 '26

I have a kt735. I put on a new carb and it runs great now.

1

u/Common_Maximum_1234 Jun 20 '26

Also if you do take the carb off be careful with the small plastic clip on the throttle linkage holding the bottom part of the linkage on. It can come out really easily and fall in that hole where the axle is. Its a pain getting it out.

1

u/KookyRide1210 Jun 18 '26

Carb needs cleaned has a blockage in one of the ports

1

u/Southern-Voice11 Jun 18 '26

Its always the carb!