CR 110 Replica ( 160cc )

 

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Last night made some steel brackets for front engine mount. But then I remembered I JUST HAPPEN TO HAVE LAYING AROUND a giant chunk of hi tech aerospace pannel. I am wondering if it will have the shear resistance engine mounts need. It is a fraction of the weight. I am not even sure what is required to cut the stuff!

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This is with the swing arm mount finished. The front end is off a CT 110 and just bolts straight up to the SL90 frame but the CT110 swing arm is wider than the SL90 swing arm. To solve this I was going to use a narrowed CT110 arm but this didn’t work out because it moved the rear sprocket out of alignment. So instead I have taken the swing arm mount off a postie frame and triangulated it. The box has added some weight but later I will drill it full of holes to take the weight out.

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This is the T2 turbo scroll from the intake side. I am still looking for a suitable place to mount it. The other alternative is a smog pump. I figure before I mount this that I will get the bike running with the twin carb setup so I have some sort of bench mark to start with.

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imageIf I was going to mount this I would be driving it with a pulley from off the stator. To do this I need to machine up a new shaft for the compressor housing. I am also wondering if I need some sort of jack shaft as I think the compressor might end up spinning in the wrong direction.

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Steps in machining the clip-on’s. This took longer than I expected but the results were all worth it. They came out terrific.

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Playing around with laying up my own shapes for the tank and seat. In the end decided it was just easier to order a seat.

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This is my twin carb setup. These are two cd90 carbs. I am using a progressive throttle linkage that pulls one open at a different speed to the other.

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Bits I scabbed up from hunting around at the wreckers. After spending ages on trying out various designs in the end I just settled for a bunch of springs. Sometimes you have to go through a bunch of iterations to find the best way.

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This is the manifold the twin carbs sit on. Machined this up on the lathe at Tafe.

Postie bike V 3.0 is coming along nicely. Motor is ported and back together. Not sure what it will run like and I hope I cleaned all the metal out of it. I may pop the head of it one more time and blow some compressed air through it just to make sure. The SL90 frame is on the way from the United States as we speak. People keep asking me why I bother with these tiny bikes. Why not just buy a big modern fast sports bike. But then they have not a clue. The CR series of bikes was one of the mainstays of Honda’s development efforts during the 60’s. Good enough for the Honda race division to dream up. Good enough for me! 170kph. Not bad for a tiny motor.

SL90 or Hawk Frame - Benelli Tank?

4 thoughts on “CR 110 Replica ( 160cc )

  1. i know what you mean im building a turbocharged ct110 with front and rear discs and monoshock everyone laughs till they see it and then try shutting them up

    1. That is it! I see it all as evolution. I started with a standard postie. Had a Lifan 125 then a 150 in it. Then I figured out the whole front end will fit on an sl90. So swapped it all over. Seemed a simple idea at the time! Had a bit of hand waving to get it to run the CT110 swing arm at the back. Had to weld up a bolt in member to carry it. Got a bit of a chain clearence issue to solve now. Was going to use half a turbo for the SC. Cops had me over last week after a bit of enthusiastic testing. PC Plod did not quite know what to do about it the bike. It was a postie yet not a postie! Hahah! In the end he pinged me on having wrong endorsement on my license!

    2. A performance CDI slhoud be used with other modifications If the engine is stock its not really worth it. However, An Inner Rotor Kit DOES help a lot It replaces the stock flywheel and ignition..most also come with a coil. You can find em on Ebay for $ 40..they are chinese so take your chances but I havnt had any issues and they really do help with reving faster since there is less weight do to smaller flywheel.

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