Does this miss sound like fuel or ignition to you ?

[Ironhorse2022]

I’ll move this to the Suzuki forum shortly but thought I’d get broader exposure here to start. I was running my 84 DT30 yesterday on muffs and noticed an irregular miss. Before I start fixing stuff that isn’t broken, I thought I’d see what you people think it may be based on sound. I’m leaning towards a fuel related issue. The motor is new to me. Supposedly had a carb rebuild by the PO and a head gasket replaced. Thanks for your help

 

[racerone]

Open low speed mixture screw 1/8th turn at a time and test run.

 

[Chris1956]

Sounds like lean sneeze. It may run better under load.

 

[Ironhorse2022]

Lean sneeze - that’s a new one on me . Consensus so far is lean - thanks. My experience with this motor was one 15 min run on the lake the day I bought the boat where it ran great at all speeds. If it had a miss at idle I didn’t notice it. Certainly there was no miss at speed so the “better under load” comment holds. I’ve also run it once in the driveway on muffs which is when I noticed the miss. It’s snowing at the moment but next time I have it running ill try adjusting the idle mix screw out a bit. Thanks for the feedback.

 

[crazy charlie]

I’ll move this to the Suzuki forum shortly but thought I’d get broader exposure here to start. I was running my 84 DT30 yesterday on muffs and noticed an irregular miss. Before I start fixing stuff that isn’t broken, I thought I’d see what you people think it may be based on sound. I’m leaning towards a fuel related issue. The motor is new to me. Supposedly had a carb rebuild by the PO and a head gasket replaced. Thanks for your help

I would start with treating like a fuel issue.Change filter /fuel water separator,
fresh fuel etc.All things you should be doing anyway.Wouldnt hurt to check the plugs.Charlie