"blue oni" 70cc mtb super moto!

This is th' bike I wanted to do before th' 47cc schwinn spoiler ( zeus zangeitsu).....but th' charisma of da spoiler seduced me to commit it to da back burner. Stupid, Stupid, Stupid....!

 

cool

sweet ride very cool looking!!!

 

I still have an "ace" up my sleeve in regards to this build.......but still waiting for an important part to finalize th' "master plan".... More pics ,yo!

 

Very Nice...Please tell me more about your induction system....How did you angle the carb?
Where did you get the air filter....The air filter is exactly what I want...Oh it doesn't interfere with pedaling does it?....Any performance gains with it?
Good Job!
Andrew

 

very cool lookin bike !!!
one question,
I always thought it was wrong to put the tensioner on the top of the drive loop, is there a reason for yours being on top?

 

thank you, beast! Unfortunately, with only 40 something miles on it, AND I babyed th' heck out of her....th' upper roller bearing on th' rod spit little itty bitty rollers inside the engine!????! The upper roller bearings are a Great idea......its just that th' cage holding em was some cheap, thin metal! The 2nd from last photo is an old engine, I'm gonna try rebuilding th' upper head/piston. Final pic is my super modded exhaust. I'm trying low buck , high concepts. Stock muffler is dremmeled open........with an aluminum cone bolted to that.............lined with scouring pads i commandeered from work where I cook:smile:..............plus, an aluminum tube for a baffle with roughly sixty holes punched thru it. Sorry to get off track there............... has anyone else had a problem with th' newer engines?????????????

 

azkronic, when I converted my 44t sprocket on my shinobi sinner bike to th' 36 there was alot of chain slop. Quite frankly I was in a rush so I didnt cut it......I used an older tensioner and ADDED it (upside down) in tandem with th' normal one. It worked so good, this deviation was used again in this application. Beside th' fact its just something different.........my main reasoning is th' tensioner wont keep trying to "lean" into th' spokes. It HOLDS th' chain instead of LIFTING it.

 

Sweet looking bike! I love the number plate and air cleaner...gives it quite a racer look.

 

Andyinchville1, thank U.....th' manifold is made up of two intake manifolds joined by silicone heater hose......, th' filter is a K&N crankcase filter I got from a local auto parts chain ($15).......it doesnt get in th' way of pedaling because its in a sweet spot juussst below th' seat. I'd love to give you a progress report on power ....but I think I got a lemon engine. If you look at th' pics....... you'll see one of the upper rod roller bearings lodged in my cyl. head. I tryed calling dax several times to get some info on these newer engines .........but, no dice. I STILL have a decent waiting once I get this engine fiasco resolved........regardless, Thank you for your time. Brian

 

may i just say that is a nice ride man

 

COOL. I like the way you did the paint.

 

Have to say I really like the look. I think its the color combos on certain parts...and love the number plates.

 

I liked photo No:11 best. The angled carb and sports type air cleaner definitely add to the competition racer styling. Lots of great details to Ooooo and Ahhh over too. :grin:

 

tensioners

the tensioner on the top puts quite a strain on the already mickey mouse output shaft,my neighbour wrecked his bike that way.the output shaft needs a pretty straight loose gravity feed.instead of it pulling up and trying to spin around the output sprocket.:shock:

 

dual-carb.......finally done.

Sorry for procrastinating..............this was th' "ace card" I had up my sleeve from th' beginning of this build. Just wanted to break-in th' engine first........not break it. These first pics are "before and after" shots of what I used to make th' intake. A 49cc pocket bike exhaust.

 

Hope this next upload works better.....

 

The last photo was a modification (drilled hole) made to the v-stack to allow more venting for th' carbs float bowl oriface. Ordered another more open-style v-stack from daves motors. Last time I tried running the stock v-stack........it would run alittle , then cut out.I took it off.......and it would run perfectly! I had a spare open style ,put it on,.......... and THAT one worked.:grin: Also, the cd from cvs (local drug,corner store chain) is making uploading difficult today for aome reason.:???: Gotta get ready for work.....will post th' rest hopefully this afternoon. Sorry for making you wait further. Brian.

 

Oh....man....sitting on pins and needles for you to come back with a performance report!
Dis you stage the carbs to open at different throttle settings or are they synchronized to open at the same rate/same time?
Andrew

 

I think you did a fine job on your bike, love the color scheme. And the bars are sooooo cool. Looking at the engine pic, It looks like the engine was running lean, wrong color on the top of the piston. Make sure none of your fittings to the intake are leaking. I like the detail on the side of the engine, but you have to consider that you need good cooling. The fins on these engines are just adequate. Consider next time to make it like a scoop, IE more open at the front. Twin carbs! man is that thing going to be murder to tune. Consider having them open one after the other. We used to do that on our hot rods back in the day, that was how we still got good low end and all the extra punch at wide open throttle, remember a carb uses air flow to draw gas up from the float bowl all that extra venturi will slow the air flow down, the engine needs to be at high speed to use the extra flow. Have fun Dave

 

andyinchville, I'd love to have th' secondary carb begin opening PROGRESSIVELY.........at 50-75% of th' primary carb's throttle opening. But, it was just simpler (and cheaper) to just use TWIN throttles. Usage is odd though......th' right throttle rotates backward....whilst th' left throttle rotates forward. Its weird......but, fun! Not too interested in ultimate speed right now (wink) just glad th' sucker is running decent.......although I'm sure I'm gonna beat on it anyway eventually.