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Scooters - 125 to 300 => Super 8 150 => Topic started by: kennygoh016 on April 09, 2023, 11:39:06 PM

Title: Big noise or bang from exhaustion pipe when started, 2-3 times then it's fine
Post by: kennygoh016 on April 09, 2023, 11:39:06 PM

My super 8 150 (2015 model) always has some big bang/noise from the exhaustion pipe when starting up. It happens 2 or 3 times at the beginning then it's totally okay.
Is it the carburetor not working properly or something else? Thanks.

Title: Re: Big noise or bang from exhaustion pipe when started, 2-3 times then it's fine
Post by: Ruffus on April 10, 2023, 12:19:33 PM

@kennygoh016, welcome here!
Banging and explosions from your mufflers side usually means a too lean gas/ air ratio.

 Could be a choked airfilter or your carb too lean regulated. Best way to find out would be an emission test in a workshop.

I would start to check airfilter and airways towards carb. Sometimes KYMCOs suck gearoil into its filter.

There is a transparent hose with a plug down under your motor, called "puke pipe"  this has to be emptied regularely from oil/ water residues.

Title: Re: Big noise or bang from exhaustion pipe when started, 2-3 times then it's fine
Post by: kennygoh016 on May 07, 2023, 01:44:20 AM

Thanks.
I changed the airfilter but the problem still persists.
Need to work on carb.

Quote from: Ruffus on April 10, 2023, 12:19:33 PM

@kennygoh016, welcome here!
Banging and explosions from your mufflers side usually means a too lean gas/ air ratio.

 Could be a choked airfilter or your carb too lean regulated. Best way to find out would be an emission test in a workshop.

I would start to check airfilter and airways towards carb. Sometimes KYMCOs suck gearoil into its filter.

There is a transparent hose with a plug down under your motor, called "puke pipe"  this has to be emptied regularely from oil/ water residues.

Title: Re: Big noise or bang from exhaustion pipe when started, 2-3 times then it's fine
Post by: Ruffus on May 07, 2023, 09:07:02 PM

Would check my scoots muffler too for any cloggings or condensate.
Tap valves correctely to be sure about  timing.
New sparkplug and cap together with a coil and cable sometimes work wonders.