[UpNorth]

Funny how stuffing up a muffler/spark arrestor with steel wool and stuffing the underside of the seat is called "Tech" by Yamaha.

[Bilyclub]

Originally Posted by marcandcali

It sounds to me like your muffer has stopped up. I had the same issue. Read your owners manual only unleaded fuel only. Thats what my 2017 manual said

I thought it was illegal to sell leaded gas in the US.

[rnicholis]

QUOTE=Kahuna32162;2065670]My cart is suddenly losing acceleration, so bad, that it can hardly make it up the incline coming out of a tunnel. I am having the same issue when traveling on MMP's that have any kind of an uphill portion.

Purchased from Carts and Clubs, who I have called and gotten a service app, but not for another week.

Wondering if any one might have any suggestions Thx[/QUOTE]

I had the same problem with my 2018 and it was due to a clogged muffler. Replaced and problem was gone.

[Mrprez]

Originally Posted by Bilyclub

I thought it was illegal to sell unleaded gas in the US.

Leaded gas. All gas in the US is unleaded.

[ronda]

I had a similar problem to what was described here. My cart seemed to sputter more when having 2 riders and going up a hill. checked for the spark arrestor, and it had already been removed. my cart is a yamaha model YDRA. I found out that a new drive belt is 35mm wide, and ithe belt is supposed to be changed when the width decreases/wears down to 27mm. I measured mine and it was at like 26mm. Turns out the belts wear from side otot side. This is because of how the "transmission" works. I'll spare you the details.

I ordered a new belt on amazon for $20, it arrived in 24 hrs and i replaced it in 10 mins after it arrived. no tools required for this replacement. took it for a test drive w/ 2 passengers and up a few hills and had no issues. I think this solved my problem.

Sounds like you have a newer model, so I don't know the spec for you, but you may want to consult the manual for the spec and measure the drive belt, to see if it is in spec.

[Kahuna32162]

UPDATE: Carts and Clubs service van was here this morning and removed the spark arrestor from my 2018 Yamaha Quiet Tech Cart. I was told that it was not necessary, but required in California as a safety measure. Was advised that the muffler did not need to be replaced. Cart now runs great. Thanks to all who posted with ideas and even pictures to show me the issue. TOTV is a great asset and I will continue to contribute.