100 Sport

[dcr]

Been here a while but just bought a 100 Sport from New Jersey. This bike sat for a long time, but luckily it was indoors. When I picked it up on Friday afternoon, it was in the kitchen leaning against the table. There were 15 motocross bikes in various states of disrepair in this guys house. Was truly an odd sight, to say the least.

Got the bike home and took the carb off and cleaned it inside and out. Took the points off and cleaned them up. The motor wouldnt turnover so I pulled the plug out and mysteriously it then would turnover. 30 seconds of looking and I discover the plug that was in it was too long. I put the right plug in, added some fresh gas and got it to run in about 5 or 6 kicks. It idles real nice but the exhaust leaks at the cylinder and where the pipe and the muffler join. The baffle in the exhaust is also missing, so its loud. Its dirty and greasy, but I believe its going to be a real gem when I'm done with it.

[slawsonb]

Sure looks like a nice find, dcr! Good luck with it...
...bert

[RayK]

DCR
Here is a photo (from35mm slide) of my Australian delivered 1968 100Sport. Note the difference in seat and tail light. Also full chain guard and blinkers.

RayK

[dcr]

Thanks. More dirt and grease to clean - just what I was looking for.

Ray - that's a sweet looking ride. Mine looks like it could host a lower chain guard, but it isn't there. I like your 2 tone seat - custom or factory?

[paul]

The Australia single cylinder bikes seem to have the two-tone seats?

[RayK]

DCR
The seat was how it came from the Ageo Factory in Japan in 1968. The photo was taken in 1968 or 1969. I rode that bike everywhere as well as for 4 years to work and evening college almost every weekday. Also went on holidays on it carrying all my camping gear.

Loved that bike. Only wish I could find one today.

RayK

[dcr]

Decided to leave this one mostly "as is" and just clean it up. It has paint issues where some of the flamboyant red has peeled off leaving the gray undercoating as well as some scratches but I think they reveal the real character of a 46 year old bike. Actually this bike is 5 months older than I am - odd when I look at it that way. Now the debate of which of us is in better shape.

This is number 2450 of approximately 18,000 built so I was hesitant to just blast away the old paint and start over. I did rebuild the motor - it was pretty beat up inside and looks to have been run without any crankcase oil. Replaced all the bearings and seals as well as cleaned up the cases. Its almost all back together but it has a broken piston ring so I put the cylinder and head on but the piston is waiting in a box for new rings. Need to finish cleaning up the exhaust, install knee pads on tank, bolt the clutch cover on and finish the brake linkage. A couple other odds and ends as well.

I'm curious on others thoughts on completely starting over with new paint versus just cleaning up and dealing with whats there?

[Mike Anderson]

Let it be. They are only original once. It would be different if everything was a mess but it does not look that way. Just my personal thoughts. Good luck.
Later Mike

[dcr]

I got to be honest Mike, you posted something to that effect on your 50 Sport and it kind of stuck with me. I was going to go full resto on this bike but your statements made me rethink that decision. So far I am glad I stuck with cleaning and polishing.

[Mopar5426]

 I Agree With Mike   Leave It Unrestored   I Have A 90 Sport Also To Nice To Restore   Some Of The Most Expencive Cars And Bikes Are The Unresored Ones  Ill Try To Find A Picture Of My 90    If You Want A Really Nice One Buy A Ruff One And Restore It   Wont Really Cost A Lot More   Crome & Paint Cost The Same   Nice To See The Little Bikes With Intrest  GENE

[dcr]

I took the State Farm Insurance sticker off the side but left the original '70-'71 NJ inspection sticker on the rear fender and the dealer sticker is still on the back.

[Mike Anderson]

Anxious to get the little 50 sport up and running. Been a busy summer so far, not any time to work on it. Probably a fall project, will be a good mate for my Taka and 100 racer. I have a one family owned 90 sport with original title that I am having thoughts about restore or preserve. The only thing with it is motor stuck. If it free's up easily I may just clean it and leave alone. Good luck.
Later Mike

[dcr]

All back together after new bearings and seals in motor. Rings were shot but I found a new piston and ring set so I replaced both. Put 32.1 premix in until I see oil pump working. Started on 3rd kick. Sounds good and idles nice. Put it in gear and it stalls out. Tried again and same thing. Stalls when under load. Put it up on stand and went thru all 4 gears. What's wrong here?

Also found out the rear rim is bent. I need a drink!!!

[disc_valve]

Hi, dcr,

Is this a case of clutch drag? If it runs through the gears on the stand, the rear wheel will be free spin, but sitting on the bike, the rear wheel is fixed so the clutch must be able to free completely or "bonk!!" it's stalled again.

Other thoughts - is the idle sped just set too slow? If it stalls out as you start to pull away, maybe the pilot mixture is too weak - check pilot jet size (should be #17.5) and air screw setting (1.5 turns out).

graham  

[dcr]

Sitting on bike I can drop it in gear with cluth pulled in and it still idles fine. Clutch seems ok.

I'm guessing carb issue. I set the air screw by manual specs but still has no power. I'm no carb expert but may tear it down to inspect the inner workings. Although I may have no idea what I'm looking at.