Upgrade Engine Black Widow 136cc

Justin4250

New member
My son has had a stock black widow and I want to upgrade it for him for Christmas. It runs great but he likes when I go with him as a passenger on some hard packed gravel roads near our house. At 220lbs I noticed it doesn’t have the power to keep full speed going up slight inclines. Is there a direct bolt on replacement engine with more power that would give him a bit more top end speed? The stock engine starts on the first or second pull every time so it has to be reliable. Any suggestions would be greatly appreciated. He uses the cart in winter mostly because he enjoys drifting in the snow.
Also. the stock tires seem to be out of stock or discontinued everywhere. Is there an after market rear tire that works?
 
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