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Old 03-26-2019, 05:51 PM
ghost civic ghost civic is offline
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I bought this yerf dog with a tecumseh engine for $100 today

I cleaned the carb, re-wired the faulty kill switch and got it running

But acceleration was slow (especially if turning) and top speed was about 20.

So I looked at the belt and it looks pretty loose, pretty sure it is slipping and causing the problems. By the time the clutch grabs the belt is half way up the pulley causing the gearing to be tall.

Anyway, I can't find a model number, not even sure where to look for it.
But I need that in order to buy the right size belt.
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Old 03-26-2019, 06:32 PM
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https://www.bmikarts.com/Yerf-Dog_ep_44-1.html
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Old 03-26-2019, 11:48 PM
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We are going to need a closer shot of the belt and TC, but all you have to do is make sure that you have the correct size belt for the correct model TC and center to center distance. Thats how easy it is. You might have some incorrect automotive belt on there that is not made for the TC.

https://www.gokartsupply.com/identify.htm
https://www.gokartsupply.com/tcbelts.htm
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Old 03-27-2019, 08:20 AM
Karttekk Karttekk is offline
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That looks to be a Yerfdog model 3203/05/08 buggy and they all take the Q43203W belt. Look at the pictures from Joe-405's link.

http://www.bmikarts.com/PDF/3205_D.PDF

https://www.bmikarts.com/30-Series-T...3W_p_3237.html

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Old 04-03-2019, 07:42 AM
ghost civic ghost civic is offline
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yes, it did need the Q43203W belt. That is actually what was on it, but the old one was worn down to only 1/2 inch width. new one is 3/4 inch wide.
Kart's acceleration wasn't great, but it would do 29mph with 300 pounds of rider (on pavement)
No matter what I tried I couldn't get the acceleration faster, probably just all the old
tecumseh could muster. I've only had a few karts, but have worked on a lot of small engines. For some reason I can never get a tecumseh to run as good as I would like.
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Old 04-03-2019, 08:21 AM
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Do a wet/dry compression test to see if the cylinder is worn. Make sure your governor is working properly, it controls engine speed. See if the exhaust port is restricted. If it has a fuel filter, change it. Make sure your torque converter is working properly, the variator weights could be worn and not rolling out correctly. Check for flat spots on them.
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Old 04-03-2019, 09:17 AM
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In short:
Start fixing things!
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