Site Information

 Loading... Please wait...
  • Image 1



Product Description



This kit is designed to fit the 49 cc Honda or Huasheng engine using the Hoot or Grubee Stage 2 or 3 gear box as well as the 4G of 7G belt drive. This kit will allow the user to shift gears using the bike's standard rear derailleur.

Here are links to additional information, read carefully before purchasing:

Product Description
Requirements for using the kit
Bottom Bracket Descriptions
Installation Manual

NOTE: If you are attempting to use this kit on a "FAT TIRE" bike please note the following additional items are required.
8 inch shaft
5/8 lock collar

Also note you will typically use the bottom bracket that is on your bike instead of the one included in the kit.

Do not forget to measure your seat tube and down tube and select the appropriate sizes.

Product Reviews

Write Review

  1. Good stuff 5 Star Review

    Posted by on 10 05 2020

    High quality product. If you call asking for help, they will listen to you and they will give you the best answer.
    I’ll come back to get few more stuff
    I’m very pleased with my purchase.

  2. Good quality parts 4 Star Review

    Posted by on 11 06 2019

    Parts in this kit are great. I broke it down to make a custom kit for a 79cc jackshaft shift kit. I was only disappointed with the gearing, I've upgraded two of the gears now (9:1 to 20:1) for better low end, otherwise 0-30 was all in 1st gear. Not sure if its just my application, but the input RPM should be the same as the 49cc motor this is intended for.

    For anyone curious 11t clutch > 28t JS#1 > 9t JS#2 > 24t CR#1 > 48t CR#2 > 34t freewheel (34t,24t,22t,20t,18t,16t,14t).
    I'm still considering the 52t chainring and possibly a 10t clutch.

    SBP Reply:
    As stated our kit is made for the Honda or Huasheng 49 cc engine with appropriate gear reduction box. I would suspect in this case no gear reduction box was being used which is why the gearing was not appropriate.

  3. Best part for 4 stroke engine 5 Star Review

    Posted by on 10 21 2019

    Installed on my grubee skyhawk frame works great with Ghost rider kit. Installed with Nexus 7 speed IGH, seems to shift very smoothly. Shift kit is very well built. worth the price.

  4. the difference between cheap and quality 5 Star Review

    Posted by on 04 18 2019

    Pick up a motor and a bike kit to retrofit a bicycle,for an engine. Wasn't real impressed. I figured I'd have to redo most of it. I'm a master machinist, have been for 35 years, I think I got a leg up on most of you guys. Wanted to run a jackshaft so I could use the Rohloff rear end, hey 14 gears, why not. Ordered SBP's Jack shift kit and it's like night and day. Still might have to tweak it a little bit but it's going to totally replace the crap I bought the first time. = )

  5. I bought it once, and now must buy one every time i make a build... 5 Star Review

    Posted by on 12 11 2018

    I bought one just to test it out with my 79cc shifter idea. Turns out, the metal is more than thick enough to take the power, everything fit together quite nicely, and, for the quality of it, it was inexpensive!! Of course, I had to do a bit of drilling to make the engine fit (slots weren't wide enough by about 1/8"), and I had to do a bit of fiddlefartin just to figure out how to get the whole thing on there. But, IT WORKS LIKE A CHARM!!!! Even missing a few bolts, this thing is solid...

  6. Nice 5 Star Review

    Posted by on 07 13 2018

    Kit well thought out and put together...shipping was quick...good product

  7. nice,,thank you 5 Star Review

    Posted by on 06 22 2018

    nice,,thank you

  8. Such good quality I came back and bought a second one 5 Star Review

    Posted by on 12 04 2017

    Everything I've received was of great quality! With the exception of a little chip off the paint of the engine mount but that was barely visible, understandably likely damaged in shipping. I installed the engine mount and shift kit on my first bike, haven't even gotten the rear wheel built and put on yet, I was so impressed by the quality of it, I bought a second set for my second bike. Customer service was great too, I called them because I entered in the wrong measurements for my first order. They were more than happy to help! They even responded to me on a weekend evening (outside their business hour), on Thanksgiving weekend! Will definitely recommend!

  9. smooth shifting and reliable 5 Star Review

    Posted by on 09 13 2017

    I enjoyed building this on my 4stroke ,it offers a lot of shifting varieties!it takes a few days of tweaking to get it smooth but it's reliable and fun!

  10. Great Design!! 5 Star Review

    Posted by on 09 02 2017

    I am a 64-year old retired mechanic, and I am very impressed with the quality and design of this product. It was fun to install on my KMB frame. I had to remove the 2-stroke pedestal mount, but other than that it fits perfectly. Make sure you buy a cassette tool, crank removal tool, and chain breaker. You will need them. I've ridden it four times with no problems or tweaks needed.

  11. High Quality 5 Star Review

    Posted by on 06 03 2017

    The quality of this kit is Top Tier. Everything was in its own package. The instructions made the assembly a lot easier but their were items in the instructions pictures that were not in the kit. So I don't know if the instructions need to be updated. The only thing that confused me for a bit was which bolts to use in the different sections. I figured it out but if they could be color coded or number stamped that would add the ease ability. All in all its the best kit on the market. I had a question so I called them up and they returned my call. The second kit is on its way. :) Excellent Product!

  12. 5 Star Review

    Posted by on 01 20 2016

    ordered my shift kit on Friday, received them on Tuesday. all looks real good. I wish you gave options on the front freewheel as I have my doubts about its lifespan. I for one would have sent you more money. can't wait to get started. thanks guys

  13. 5 Star Review

    Posted by on 07 09 2014

    Very high quality, well made and strong. I will definitely be a returning customer. I highly recommend this kit, and this company. Great customer service! This kit is like a dream come true compared to the basic left hand drive set-up. Well worth the cost considering all the quality components, especially the engine mount. 10/10 Would ride!

  14. 5 Star Review

    Posted by on 11 03 2013

    The best kit available without a doubt. Very professional.

  15. 4 Star Review

    Posted by on 09 05 2013

    Kit seems great. all the parts fit together with minium filing and are very ingenious. i wish the crankshaft was wider as my 4 stroke is quite wide on the frame but besides that seems great.

    mad props to the team at sbp. great customer service!

  16. 5 Star Review

    Posted by on 12 01 2012

    I m not 100% complete with this kit, just need one more part. But I am so pleased with how all the parts went together as they should and how well it is documented on how to get this all together. Bought a complete 4 stroke gas power bike kit (Bike & engine) from Bike Berry and nothing was going right with it, not even the engine would fit the bike it came with. Saw this site and figured I would take the chance on it, I am so glad I did! The package came in and first off, it will well packaged. Opened the box and all the parts are in there own group and in there own bags, not all just dumped in to one bag of hardware like my BB kit was. Due to my bike frame I need the adapters to convert my 1 piece bottom bracket (BB) to the standard 3 piece, once that is done, I am all set. I am sure I will be posting more info one I get this going. As it is, I got to say Thank You SBP for a well put together kit with quality parts.

  17. 3 Star Review

    Posted by on 06 22 2012


  18. 5 Star Review

    Posted by on 06 24 2010

    Just purchased this item, took it two days to receive it(AWESOME!), A night and morning to install it,
    install went smoothly only problem was with the hight of the engine, nothing a little sawing didn't solve, ha-ha. Ridden my bike three times now and loving everything the 4-stroke shift kit did for my motor-biking. Thank you Sick Bike Parts.

Find Similar Products by Category

Click the button below to add the *4 Stroke Shift Kit SOLD OUT TEMPORARILY to your wish list.