Scooterguy Mount With Tanaka 47R Engine

Discussion in 'Frame Mounted Engines' started by 5-7HEAVEN, Jun 27, 2010.

  1. 5-7HEAVEN

    5-7HEAVEN Guest

    I might not have mentioned my center-mounted Tanaka 47R engine on my Diamondback Response bike. It originally had friction drive and a different engine. I wasn't too happy with the setup, so I'm trying the Scooterguy drive/shift kit.

    I fired the Tanaka 47R engine up today for the first time. it took me months to figure out how to connect the Scooterguy front mount to the Diamondback's "strongbox" frame tubing. The used engine was purchased online from a goped forum. It just needed an air cleaner, and gaskets for carb, intake and exhaust.

    It is LOUD!:ack2:

    The bike just threw the new chain, so I'll take out one link.

    Hawaii Ed is dropping by tomorrow to adjust my derailleur. We'll have pictures then.:detective:
    Last edited by a moderator: Jun 27, 2010

  2. 5-7HEAVEN

    5-7HEAVEN Guest

    I removed one link, which tightened up the engine drive chain again. To adjust the chain, one needs to loosen all the Scooterguy bolts and nudge the entire assembly a bit with a rubber mallet. Hopefully this tight chain will stretch "tsukoshi" (a little) and settle in.

    The "Trevor Thompson" exhaust manifold was severely damaged, so I replaced it with a new ADA manifold. It's a tighter fit, hopefully no leaks and QUIETER.

    The 5:1 gearbox has the 11-tooth sprocket, so it should also be FAST!

    I'll be at the park for test and tune until Hawaii Ed and his friend arrives. This is its maiden voyage. Hopefully, this bike will be roadworthy so we can ride to McD's a half mile away. The derailleur needs adjusting;hopefulley Ed can fix that.

    Pictures soon of this bike, as well as Hawaii Ed's Happy Time/SBP shifter and his neighbor's twin-Honda/Staton chain drive/NuVinci!:detective:
    Last edited by a moderator: Jun 27, 2010
  3. Stoney

    Stoney Member

    I'm looking forward to the pics and the updates on scooterguy and double nuvinci. Ya'll must must some fun hanging out and cruising:grin5:
  4. 5-7HEAVEN

    5-7HEAVEN Guest

    Hawaii Ed and Rick, my new friend arrived at my house this morning. Ed replaced and adjusted the derailleur and we were off to McD's. Ed has his Happy Time engine/SBP shift kit. At present, Rick has single Honda 1.6hp with Staton/NuVinci(awaiting second engine and Staton twin-engine drive box). Mine is Scooterguy mount with Tanaka 47R.

    My engine mount shifted again and loosened the chain. We ate at McD's first, then Hawaii Ed adjusted the mounts, which tightened the chain. Less than a half mile, the bike threw the engine chain, so we pulled over. Ed and and Rick adjusted the mounts and 10 seconds later, my bike threw the chain. This time Rick lengthened the chain, Ed readjusted the motor mounts. Less than1/4 mile away, the bike threw the chain again. This time, I told Ed and Rick to motor on, and I pedalled/pushed my bike home.

    I will need to drill holes thru the frame, to keep the mounts from dropping down. This will secure the engine mounts and prevent movement.

    I also need to replace the ADA S1 pipe with the stock muffler. The pipe is right where my left leg is, and I've got the burns to prove it! LOL!

    Actually, it was a good shakedown cruise! Rick's engine is very quiet. Ed's engine is very quiet. At one traffic stop, I asked Ed if his engine was running. He said yes, and blipped his throttle.

    I have a VERY loud engine. I might use two mufflers.:whistling:

    Hawaii Ed will post pictures tonight. Thanks for all your help today, Ed and Rick!:bowdown:
  5. 5-7HEAVEN

    5-7HEAVEN Guest

    After incurring second-degree burns on my left thigh, the ADA S1 pipe was replaced with a stock muffler. While removing the pipe, I noticed a LOT of oil had blown out near the new exhaust gasket. This was because BOTH exhaust bolt holes were crossthreaded, not allowing the exhaust flange to seat. A quick fix was to install two locknuts behind the exhaust flange.

    No wonder the engine was LOUD. That had confused me, because the ADA S1 pipe was always able to quiet down all my engines, even the GP460.

    Hawaii Ed dropped by and helped me remount the Scooterguy drive kit. It was necessary to drill through the bike's frame to securely mount the Scooterguy system. There was no other way to keep the engine secure. With the engine mounted solidly, the Tanaka 47R engine fired up quickly. It sounded MUCH more quiet than its first maiden run. Ed said it's quieter than a moped, so the bike should not be a cop magnet on the road. LOL

    Throttle response was good, but sluggish. Ed said that was because I was starting off in high gear. LOL Ed has a shift kit, so I let him testride my bike at the park. Unfortunately the original chain snapped, so a new KMC was installed. Ed got the bike up to 30mph before the bike developed "chain suck". Testride is over until the new SBP shift-stop arrives.

    Looks very promising. The engine did not shift out of position and throw the chain. The bike weighs just 55lbs., so with 2.8hp, I should be able to keep up with Hawaii Ed.:jester:

    I dunno about our friend Rick. Instead of buying his Staton twin engine drive kit, I loaned him my 5hp GP460 engine. With his Staton/NuVinci drive, Ed and I might be smelling his fumes down the highway on our rides! LOL!:bowdown:
  6. 5-7HEAVEN

    5-7HEAVEN Guest

    The Jump-Stop chain guide from SBP arrived, so I installed it. The bike chain was replaced with a new one AGAIN, and off I went for a testride in the nearby park. Everything worked very well, but I need to find my shiftpoints. Next came the downhill ride. Right before I pushed off, the engine chain grabbed my right shoe laces. Must make a point to double-up on the lace knot to shorten it.:ack2:

    The Scooterguy chainring sprocket for the bike chain is much too small, maybe 21teeth. Must try a larger chainring, because pedalling this bike is literally going nowhere.

    Engine runs fine, not too loud, shifting is unbelievable, even if it's only 5 gears available. Shifting from 1st to second, and second to third is AWESOME and VIOLENT! The entire bike wiggles like a swimming fish for an instant, upon each shift. Engine rpm drops and rises on shifting. Too much fun!

    Unfortunately, the bike chain slipped past the Jump-Stop and wrapped around the BB again. This is the second new chain that broke within an hour after being installed. When I got home, I repaired the chain and installed the correct XRAM derailleur. I also installed a hoseclamp directly above the Jump-Stop, to stabilize it. A wooden spacer will be placed behind the Jump-Stop guide, to keep it from going out of adjustment.

    "The White Lady" is fixed and ready to go. It's midnight, and I can barely wait for daylight!:jester:
  7. Fulltimer

    Fulltimer Member

    Setting here on pins and needles waiting for the update!

  8. Bonefish

    Bonefish Member


    Sounds like we encountered the same problems with our 76/78 mm cent. clutch frame mount shift builds, I didn't get the jump-stop but interested in how it works out for you. I instead just cleaned my chain and it stopped the chain suck for me, for now anyway.

    Here are a few articles that I read/used that helped me.

    I have not had a friction drive to compare these builds too, but I think you are setting up a build that you will be very happy with after you get the everything adjusted.

    I shift mine down and put it on the big rear cogs to climb hills/mountains like a champ without pedaling, and then shift it to the small rear cogs on flats and fly.

    I do not have to worry about broken spokes with any thing mounted to them, or excessive tire wear with a friction roller eating them.

    I love my setup, you will love yours too.
  9. 5-7HEAVEN

    5-7HEAVEN Guest

    Hawaii Ed will confirm that I have had MANY flat tires on friction drive. In fact, I've probably had more flat tires than anyone else on this forum.:ack2:

    Ed is dropping by; he can adjust my Jump-Stop guide.

    Hopefully, the new(correct) derailleur will help to stop chain suck. I'm just glad that the rear wheel does not freeze up when the bike chain wraps around the bottom bracket.:bowdown:

    The tanaka 47R engine is wheezing in first gear at top rpm. Methinks it's the flame arrestor in the Mitsubishi muffler that's choking the engine, just like it choked the Mits engine. I'll remove the flame arrestor screen. It'll make the engine a little louder and the exhaust fumes are hitting my leg. I'll redirect it with a length of hose and install the $6 muffler from SBP.

    On the hill near my house, I started at the bottom in 1st gear, shifted thru all of them and ended in 5th gear at 30-something mph.

    In the right gear, the Tanaka 47R has EXCELLENT pulling power.

    I need to correct this chain suck. It seems to be one of only two problems. The other is the 20-tooth chainring. It must be replaced with maybe a 30t sprocket.
  10. 5-7HEAVEN

    5-7HEAVEN Guest

    Hawaii Ed dropped by and checked out my bike. He straightened out a bike chain link and said the derailleur and Jump-Stop looked okay. Later, I removed the fire arrestor screen in the muffler, installed a 1/2" exhaust hose and SBP muffler and went for a testride. The engine sounded a little quieter, which is a good thing. I babied the shifting while running on a stretch of road. The new derailleur performed flawlessly. However, in a few minutes, I heard clanging sounds. The engine drive chain fell off its chainring sprocket and had dropped onto the bike chain, which then fell off its sprocket and onto the bottom bracket. Luckily, both chains easily slipped back onto their chainring sprockets. However, for some reason, the engine drive chain was moderately loose, but good enough to motor slowly home. I can't believe that the engine drive chain came loose, because the Scooterguy drive is securely bolted onto the frame.:detective:

    Methinks I have to align the engine drive chain better. It is an 8mm chain and VERY heavy duty. I also need to take a better look at, or replace the KMC bike chain. Maybe I'll try the Shimano chain that Hawaii Ed is using.
  11. Bonefish

    Bonefish Member


    You probably have a stronger build with using the 8mm chain for the engine to drive on. I run 1/2 x 1/8 BMX chain on mine. The disadvantage is I don't think(but not sure) it is as strong as 8mm chain, however the advantages is that it is easy to come by and I don't have to wait for it to come in the mail and it is readily available if I break down at any bike shop. I can also use a standard rear derailleur wheel to make/fashion a chain tensioner wheel.

    If you do not have one of these, I highly recommend trying to make one that will mesh with your 8mm chain. It is best to run it on the right/front side, not the load side, and you will find your drive chain falling off the chainring problems subside significantly.

    Hope this helps,
  12. 5-7HEAVEN

    5-7HEAVEN Guest

    The standard derailleur pulley won't work as a tensioner. I tried.:ack2:

    Maybe a skateboard wheel will work.:idea:
  13. Bonefish

    Bonefish Member


    Couldn't tell you about the skateboard wheel, Haven't tried one. If you can get with Hawaii Ed and see if he has an extra tensioner wheel from one of his china 68.5/80cc kits I think this will work for you, or you could probably get one off of ebay. It has a channel groove lip on outer edges to keep the chain from falling off the tensioner wheel and I think it will roll the 8mm chain nicely for you. I would loose the mounting hardware though that comes with the wheel. It is shoddy and a bulky/weighty mass one does not need attached to our nice bikes. Take the wheel off an mount it on something lighter/better. I used a rear rack stay support brace for mine. It works good.
  14. 5-7HEAVEN

    5-7HEAVEN Guest

    I tried a skateboard wheel on my Staton chaindrive. It seemed to have worked pretty well. Will keep working on it.

    I should contact Jerry, the Scooterguy.:idea:
  15. Hawaii_Ed

    Hawaii_Ed Member

    I have all kinds of happy time pieces lol! I am sure we'll work it out...takes some tweaking on these chain drives :)
  16. 5-7HEAVEN

    5-7HEAVEN Guest


    Ed, do you have the picture of our bikes outside McD's?
  17. Hawaii_Ed

    Hawaii_Ed Member

    I totally forgot to post pics lol!
  18. 5-7HEAVEN

    5-7HEAVEN Guest

    Hot Muffler!

    That shiny pipe gave me THREE second-degree burns that day!:ack2:

    Should've taken pics of the burns. lol

    I replaced that ADA S1 pipe with a stock Mitsubishi "can", the hose and a $6 SBP muffler. The engine was VERY loud because of leaky exhaust flange. Now it's legal-quiet, STILL has awesome power.

    After McD's, the guys and I were headed to Home Depot to look for a leather "welder's sleeve". I figure that an extra-large sleeve could be tailored to fit my leg.

    That way, I can re-install the shiny pipe back onto the Tanaka engine. LOL

    You are gazing at probably the three fastest bikes in Honolulu.:detective:

    Besides Hawaii Ed's 57mph bike, the other one is Rick's Specialized with Honda GX35 engine, Staton chaindrive ANNND NuVinci hub!:bowdown:

    To keep up with Ed and me, Rick is swapping in my GP460 engine that I'm loaning him.

    Now Ed and I will be trying to keep up with HIM! LOL:bowdown:

    BTW, the front mount is made of BMP aluminum support struts.
    Last edited by a moderator: Jul 10, 2010
  19. Nuttsy

    Nuttsy Member

    Regarding chain guides/tensioners, I had a similar problem with the chain jumping off the sprocket and decided that the skate wheel would be the thing. However, I didn't use it to TENSION the chain, but only to GUIDE it onto the sprocket on the slack side. I actually had to add links to do this. Tension is maintained on the power side of the chain with a Tractor Supply (Baja MotorSports) spring roller. However, the spring is VERY lightweight (not the original) and just keeps the chain from developing a harmonic oscillation. The way the skate wheel guide is setup, it can't let the chain come off the sprocket. There is just no room for it to jump. Yet the chain passes through both without any drag.
    So far I've got a couple of hundred miles on this setup and ZERO chain problems.
    Smooth and quiet.

    Attached Files:

  20. 5-7HEAVEN

    5-7HEAVEN Guest

    EXCELLENT ingenuity, Nuttsy! I may try that out myself!:bowdown: