Loncin 4-stroke, Nuvinci, Stretch Frame

[i-paint]

This was my winter project I recently finished. We've had a few warm days so I had a chance to test it. Very smooth, cruises nicely around 40 mph. Top speed (checked with car speedometer) was 53 mph. I believe it will do better as it gets broken in. The engine is a 70CC. It was way less than a Honda or the Chinese 4 strokes. My Nuvinci hub won't last long I'm afraid using these speeds and torque. It sometimes skips when it gets hot after a long run. I have about 75 miles on the bike by the way. I twisted the axle in the dropouts using one set of locks. I have two on each side now and that seems to be holding. The chain tensioners in the picture have lockout washers that fit over the axle and in the slot as well as one on the outside to keep it from twisting. The twin disc brakes on the front are an improvement over the single but I would like for them (the pads) to be bigger. I will continue to work on this one trying to get more speed and maybe play with some lighting.

PS I know the chain from the engine to the jackshaft is a little loose. I changed the sprocket and didn't tighten it. The sprocket on the engine "floats" back and forth to keep the chain perfectly in line so it doesn't want to come off anyway.

[Tcams]

This bike is sick. You should get a video of that thing mobbing down the street! That would be cool to see.

[Crazy Horse]

i-paint, this build is amazing especially since it's a Stretch Cruiser ( Micargi ? ), I've been slow to complete my stretch cruiser ( Greenline ) with a 110cc lifan horizontal 4-stroke semi-automatic see my post: http://motorbicycling.com/f40/notice...tretch+cruiser

For others interested these motors are all copies of the old Honda CT 70 Trail Bike & Honda 50 Mini Trail Bikes.

I originally started my build in July 2009 using the Greenline Stretch Cruiser with an extra 110c motor from a hardknock bobber but had to delay it, hopefully it'll be rideable soon!

I'll post a couple of pic's here of the old Honda Trail Bikes showing this type of horizontal 4-stroke same used on hardknock bobber's, so that others can have a better idea of where these motors came from and how they are so practical for Stretch Cruiser builds.

i-paint, maybe you can share with us more details about your build, how did you mount your motor to the frame, where'd you purchase your motor from, is your motor fully automatic, how much $$$ invested in this build so far, how many hours wrenching to date, etc etc...

My hardknock bobber does almost 60mph i'm a lil bit intimidated as for how fast my Stretch Crusier go I'll guesstimate close to 60 or more miles per hour!!!

IMO you will definitely destroy that nuvinci hub using your 4-stroke loncin motor.

Keep up this amazing work with your Stretch Cruiser, your work will inspire others to be sure!!!

BTW here's Civlized build another forum members horizontal 4-stroke stretch build using the same type of motor:http://motorbicycling.com/f40/atv-50...tretch+cruiser &

heres another members build same type of motor:http://motorbicycling.com/f37/fully-...tretch+cruiser.

i-paint, Just found your original post:http://motorbicycling.com/f40/stretc...tretch+cruiser

Peace C.H.

First two pic's are yellow 1968 Honda Mini Trail Z-50, 1969 Red Honda Mini Trail Z-50, 3rd pic is 1970 Honda CT 70 Trail Bike, 4th pic is my hardknock bobber 110cc right side, 5th pic my 110cc bobber check out that shifter.

[i-paint]

Crazy Horse, I originally mounted a Lifan 125CC 4 speed in this frame but decided I didn't want to have two tramsmissions. I dont think the Lifan would fit in the Greenline stretch I had before this one, at least not level. I have a slotted plate welded to the frame the engine sits on. Four bolts on the bottom of the engine attach it to the plate and it adjusts back and forth. One of the pictures shows this as well as the chain tensioner I am using on the engine. The torque on the engine chain tries to pull the engine back and loosens the chain. I don' keep very close records of what I have in the bikes and use a lot of the parts over. The engine was a $139.00 special I bought from High RPM Racing Online Store. I do believe it is a quality part comparatively.

[Venice Motor Bikes]

I love it!!!
How did you make the dual disc brake??

[i-paint]

Originally Posted by Venice Motor Bikes

I love it!!!
How did you make the dual disc brake??

I bought the hub and calipers from Choppers R Us. I had the hub machined to accept the sealed bearings. To mount the calipers I duplicated the bracket on the left fork that I had. I taped the two fork tubes together and used bolts through the existing bracket into the loose one. Using the bolts and nuts to achieved the correct placement of the loose bracket, I welded it to the right fork.

[Venice Motor Bikes]

Originally Posted by i-paint

I bought the hub and calipers from Choppers R Us. I had the hub machined to accept the sealed bearings. To mount the calipers I duplicated the bracket on the left fork that I had. I taped the two fork tubes together and used bolts through the existing bracket into the loose one. Using the bolts and nuts to achieved the correct placement of the loose bracket, I welded it to the right fork.

Cool! Can you post some pics??

[civlized]

Sweet looking ride, i-paint. Good work on the whole bike, especially the dual disks

[Crazy Horse]

Originally Posted by i-paint

Crazy Horse, I originally mounted a Lifan 125CC 4 speed in this frame but decided I didn't want to have two tramsmissions. I dont think the Lifan would fit in the Greenline stretch I had before this one, at least not level. I have a slotted plate welded to the frame the engine sits on. Four bolts on the bottom of the engine attach it to the plate and it adjusts back and forth. One of the pictures shows this as well as the chain tensioner I am using on the engine. The torque on the engine chain tries to pull the engine back and loosens the chain. I don' keep very close records of what I have in the bikes and use a lot of the parts over. The engine was a $139.00 special I bought from High RPM Racing Online Store. I do believe it is a quality part comparatively.

I-Paint, thanks for the lead at High RPM Racing at: Loncin Engine - 110cc Dirt Bike - $139 SPECIAL 70cc Engine Complete - Full Auto - No Reverse - $139.00 - HighRpmRacer.com

I talked to Devin at High RPM Racer he has plenty of these motors which can be ordered with wiring harness & handlebar-control switches for lights, turn signals & brake lights, horn, keyed ignition, cdi module, the works!!!

I just posted on your original thread for this build, I'm curious about your combination motor mount & jackshaft freewheel can you please share with us Stretch Cruiser builders details of this setup for the 50cc/70cc loncin 4-stroke horizontal motor did you make any adjustments from the Lifan 125cc mounting & jackshaft?

Peace Crazy Horse

[i-paint]

Originally Posted by Crazy Horse

I-Paint, thanks for the lead at High RPM Racing at: Loncin Engine - 110cc Dirt Bike - $139 SPECIAL 70cc Engine Complete - Full Auto - No Reverse - $139.00 - HighRpmRacer.com

I talked to Devin at High RPM Racer he has plenty of these motors which can be ordered with wiring harness & handlebar-control switches for lights, turn signals & brake lights, horn, keyed ignition, cdi module, the works!!!

I just posted on your original thread for this build, I'm curious about your combination motor mount & jackshaft freewheel can you please share with us Stretch Cruiser builders details of this setup for the 50cc/70cc loncin 4-stroke horizontal motor did you make any adjustments from the Lifan 125cc mounting & jackshaft?

Peace Crazy Horse

No changes to the engine mount. These engines are like the Morini two-stroke. There are several models, different CCs, which use the same base. They only change the cylinder and head (sometimes) to get diferent CCs. The 50 and the 70 have the same stroke but different diameter pistons. The 90 and the 110 are the same way. A 110CC will fit on the same mounting as a 50CC. However the stroke is shorter on the 70CC than the 125CC and the cylinder is shorter. This moved my exhaust pipe toward the rear of the bike about an inch or so and I had to rework the bracket that holds the end of the pipe. This is the only change I made. The jackshaft is in a pipe with a machined i.d. to accept the 5/8 bearings. The reason for the freewheel on the crank chain end of the jackshaft is so the crank chain doesn't turn when when under power. The only reason for the freewheel on the crank is to attach the chain wheel. If you have a crank with the proper size chain wheel the freewheel isn't needed. The freewheel on the engine side driven sprocket is so when you pedal the engine chain doesn't turn making it a lot easier to pedal. There is another freewheel on the hub. I have included a picture of the mount which is supposed to be equal to a thousand words more or less. i-paint