I have decided that the 4th version of the Red Hornet would be my trusty old HS mated to an internally geared Shimano Nexus hub. Since motorized bicycle engines are left hand drive and hubs are right hand drive, I need a jackshaft to transfer power. The HS engine mount that comes with kits is large and bulky and would interfere with the drive line for my left hand chain, so I fabricated this engine mount which is open in the rear and provides a clear drive line for the primary drive chain. It's made from one piece of 1" x 1/2" x 5.5" steel welded to a steel plate drilled to match the mounting holes on the bottom of the HS case. Each end of the mount is drilled and tapped so a bolt can be used to connect the mount to Kuryakyn-type clamps. The mount is very solid and simplifies installation of the engine. I am currently making the jackshaft from two 5/8" pillow block bearings and a 10" x 5/8" threaded and keyed shaft. The jackshaft will be mounted to the downpost using a large aluminum CB antennae mount. I will post photos as the project progresses. I'm hoping the HS and 3 or 4-speed hub will make the bike more practical with good take off and resonable top end. I also have a Sram Automatix 2-speed hub that I might lace up for the project if I can figure out how to purchase Cesur's disc brake adapter. The automatic would be legal, the 4 speed would not be.
custom Huasheng engine mount
- Thread starter Scootmeister
- Start date
Kuryakyn makes an entire line of motorcycle accessories. Their clamps are used to mount forward foot pegs or extra running lites on touring bikes. The clamps are very strong and fit several sized tubes.
The guy on the right made em.... First name Illya
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Inovative problem solving and interesting concept! SUBSCRIBED! I've been thinking of a clamp like this for some time and had NO idea that they were actually already being made! Thanks! http://cycleplicity.com/products/72...o1&network=g&gclid=CN2D0siIp7oCFQmCQgodT3UAng
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In cases where a hinged clamp won't work, you can use a trucker's antenne mount. It's made from aluminum and comes in two halves that are held together with 4 bolts. It's actually a little more substantial than the Kuryakyn clamp and it has a flat surface for mounting things like jack shafts or tensioners. You can get them at truck stops for $20 apiece. I have used them for engine mounts as well.
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I had never heard of that Kuryakyn clamp name, either... thanks!
Yah, I remember david mccallum... lol the uncle guys.
I guess now it would be nsa guys??? or the guys from homeland ???
rc
Yah, I remember david mccallum... lol the uncle guys.
I guess now it would be nsa guys??? or the guys from homeland ???
rc
Nice.
Is that for a 49cc 4-stroke HS?
What are you using for a primary reduction?
Are you planning to use a tensioner between the engine and JS to adjust that chain, because you won't have any motor movement with your motor mount holes.
Just curious.
Is that for a 49cc 4-stroke HS?
What are you using for a primary reduction?
Are you planning to use a tensioner between the engine and JS to adjust that chain, because you won't have any motor movement with your motor mount holes.
Just curious.
It is a 49cc Huasheng. The flywheel cover has been modified to make room for two lighting coils I installed to run the headlight and tail light. I don't particularly like chain tensioners so I probably won't use one. Instead, I will design the JS to slide up and down on the downpost for adjustment. The primary reduction is a Skyhawk, stage III gearbox. I've been out riding my new mountain bike today, so no progress. I'll probably get back on it tomorrow.
Here is the next step in this project. I fabricated a jackshaft from two 5/8" self-aligning pillow block bearings, with zerk fitting for lubrication, and a 5/8" fully keyed shaft. The mount was made from 1/4" x 3" flat steel and a piece of angle iron from my scrap bin. The jackshaft will mount below the custom engine mount and will pivot so I can adjust the chain. The final drive sprocket will connect to a dual sprocket freewheel mounted to the pedal shaft. I don't have the rive sprocket on the shaft yet. The problem with a project like this is it takes so much time to get the angles and measurements just right. The next step is to actually mount the jackshaft to the motor mount. Pictures to follow,, stay tuned.
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Hey Curt. You can get them at just about any farm supply house or maching house like Grainger. I got mine on line from a company named Carnell bearing supply. They are good folks.
I was in the workshop again today fabricating the next step in my custom engine mount. The Jackshaft mounts beneath the engine mount in the "V" of the frame so it's out of the way. The mounting bolt on the left is in a threaded hole and when loosened allows the jackshaft mount to swing up or down a few degrees for chain adjustment. The nut on the right tightens the mount over the adjustment slot to hold it in adjustment. I will need to purchase a 9 or 10 tooth sprocket for the primary drive and another 9 or 10 for the secondary. The secondary sprocket will be connected to a dual sprocket freewheel on the pedal shaft. The second sprocket will drive the final drive sprocket on the rear wheel. The jackshaft is heavy duty and would probably be better with lighter pillow blocks. Mine are 1 1/2" wide, 1" would be better for the overall width of the unit. The good news is they will outlast the bike and the engine.
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Holy Overkill Batman...
It will be interesting to see how you get the final small JS sprocket and big chainring transfer sprocket to fit that close to the BB and still have the big final drive sprocket line up with the rear wheel sprocket once all the chains are on.
I'm subscribed and following with interest as I am building yet another HS 49cc 4-stroke 3-speed shifter with $200 SBP 4-stroke shift kit today.
It will be interesting to see how you get the final small JS sprocket and big chainring transfer sprocket to fit that close to the BB and still have the big final drive sprocket line up with the rear wheel sprocket once all the chains are on.
I'm subscribed and following with interest as I am building yet another HS 49cc 4-stroke 3-speed shifter with $200 SBP 4-stroke shift kit today.
It will be interesting for me as well since I'm building this as I go along!! My saving grace will be the fact that I don't intend to pedal so the chainring doesn't have to be functional except as a transfer point for power from the jackshaft. I'll be putting a 10 tooth fixed sprocket on the jackshaft output, and probably a small 16/18 dual sprocket freewheel on the pedal shaft, small enough to fit and still get a chain on it. I haven't figured gears ratios yet, so again, I'm flying by the seat of my pants. Also, the photo shows the jackshaft all of the way down. There will actually be more space once a primary chain iis installed. If it doesn't work, I'll simply reconfigure. I thought about the SBP jackshaft, but I'm sort of a build it myself kind of guy. Sometimes that's a good thing and sometimes it isn't.
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That seems a little short sighted considering the 49cc HS likes some pedal help and why remove an already present means of propulsion?
Do it yourselfer's are what make innovation possible and like you I can usually innovate myself out of a jam, I just don't go looking to reinvent the wheel for everything when it has been done to about the best it can be.
Take Jim and Paul (Pablo) at Sick Bike Parts, they were already months into their 2-stroke engine mounted jackshaft design when I found their topic on one of the forums in 2009.
Trial and error until they got it working and available as a parts kit.
I tried my first one in early 2010 and I was hooked. They were a pain to install with a 3 part frame but they made it 1 piece soon so it got easier and I have built like 50 shifters so far and have another 4-stroke 3-speed in the bay right now.
My point for you is it's just a big box of parts that all work great together and a structure to attach them for a good price.
The thing is you don't have to use their mount structure, be creative all you want, you'll just have all the perfect parts for the best gear ratio for an HS 49cc including a complete bottom bracket to keep functioning pedals which is the 'magic' freewheel bearing for the dual sprockets.
I applaud your ingenuity Scootmeister I truly do, I am just trying to save you some grief early in your design because I know first hand the forces involved in transferring all that rotational torque around and there is no room the errors I see in your design so far is all, but hey power on bud and I'll root for you to find a better or cheaper or easier shifter kit as I LOVE building shifters!
RHD?
http://www.ebay.com/itm/Transmissio...697?pt=LH_DefaultDomain_0&hash=item35cabf6979
there's a #410 sprocket on sale for this spline pattern too.
I think they change the rotation or direction and it would run backwards. Would have to turn the motor around.............Curt
RHD?
http://www.ebay.com/itm/Transmissio...697?pt=LH_DefaultDomain_0&hash=item35cabf6979
there's a #410 sprocket on sale for this spline pattern too.
Hey KC, I think with a final ratio of 29:1, first gear of the Shimano Nexus will give the little HS all the help it needs with a reduction of .733. I should be able to cruise trails and dirt roads with ease. I used this configuration with a 2-stroke right hand drive engine, but wanted to hook a 4 stroke to the Nexus hub to see how it pulls. I didn't show a photo of my SBP freewheel in the previous posts because I'm waiting on a box of sprockets. The driven sprocket on the freewheel will be a 24 tooth, and the drive sprocket for the final drive will be the custom 11 tooth driving a 36 tooth on the Nexus hub. I put over 2500 miles on this setup with the 2-stroke, hope it works as well with the Jackshaft which I like because it gives you so many gearing options. I agree, the SBP kit is a good option for those who don't to make their own. I'm designing mine around the custom engine mount because I just don't like the 3-piece mount that comes with HS kits. I like to source my own parts,, I buy 8.8 hardened bolts and the bearings in my pillow blocks are Japanese instead of Chinese.
