Performance Timing Advance Key/Rocket Key Fits 33cc, 36cc, 43cc, 49cc, 52cc Hausheng Engine Gas Scooters, Go Karts, Pocket Bikes, Mini Choppers

Daughter approx 40lbs with 14t front sprocket hit 34mph but took a lot of distance for the rpms to open up the Reed valve, with the Rocket key installed to the right, it hit 34mph very quickly, so I highly recommend it if you are looking for faster acceleration an to open up your Reed valves in a shorter distance , best 12$ I've spent on upgrades so far

For the pocket bike I had a lightened flywheel a Big Bore Kit and a 7 tooth clutch sprocket this key worked very well 35mph I weigh 1502nd motor My YD 100 Motorized bicycle application needed file work to adapt it for the crank/magnet might be something to help me with high rpm miss issue

Did not fit my honda engine af18 that I'm building. It was a gamble but no go sadly.Key looks solid though, gonna hang onto them for something eventually.

It makes the engine rev higher and possible faster. Power difference is not noticable. Slight change of exhaust note which is cool. Pair it with a racing carburetor with a true velocity stack and it will make it better. My only concern is that it looks cheap and not like forged quality. Looks like cast iron and most likely casted. Still works so far.

Seems like a great concept, however it is not as wide as a normal woodruff key, so it doesn't sit snugly in the keyway on the crankshaft. I had to be very careful that the magnet in the flywheel didn't displace the Rocket Key while I was sliding the flywheel onto the end of the crankshaft. Have not given it a test run yet, hopefully the test run will make up for how poorly the Rocket key fit inside my BRAND NEW full circle crankshaft.. I'm going to be ordering a couple standard woodruff keys just to have them on hand, because I don't see this Rocket key holding up long term. Will update after test ride.Also, the pictures included on the instructions are terribly blurry.*UPDATE* Bike ran great for about 1 hour. Then it suddenly died and wouldn't start again. Upon further inspection I realized the engine had jumped time because the cheaply made cast aluminum "rocket key" had sheered in two and ruined a brand new flywheel in the process. NOT WORTH THE HEADACHE FOR MARGINAL POWER GAINS!

Highly recommend this upgrade except be careful that you're installing this to your engine. Not all upgrades will be safely compatible with this upgrade as this changes major mechanical workings fyi..do your research.

Advances timing 10 degrees

I haven’t installed yet. It looks to be a nice piece.