1957 Schwinn 99cc Predator

bluck

bluck

Active Member
-1957 Schwinn Original frame
-99cc Engine only 16.5 hours driven on it
-Custom made aluminum flywheel
-PZ19 carb
-Sportsman Flyer wide cranks and pedals
-EZ-Qmattic silent transmission gearing can be adjusted just by turning pulley in or out
-Custom made gas tank
-Monark II HD Fork with Disc brake adapter
-AGK custom exhaust pipe with RLV muffler
-Pirate Cycles 56t sprocket with Manic Mechanic sprocket clamp adapter
-Aftermarket breather filter already oiled
-Comes with tachometer(allows you to see engine RPM's, number of hours driven and max RPM)
-Heavy duty rims with 11g spokes and puncture resistant tubes with slime on rear

Really debating whether to keep it or not. Currently geared to go 35mph on 5000rpm(used my phone gps to check). The highest gearing which I used to have it at was 48mph around 4900-5000rpm not as much torque though. I say a little higher gearing would be better maybe 40-43mph at 5000rpm. I think that would be the best. It turns on in one pull and sometimes 2 pulls the jetting is really good but maybe one size up on the pilot jet for that 100% tune. Does not need to be re-jetted though. I used all last week to head to school since my motorcycle did not want to turn on all week(I think electrical problem from the rain). Asking 1,100 which is a great prize I believe. There is nothing left to do on the bike I built it to be the most reliable bike at my house to use in a pinch anywhere. Really gonna miss it if it happens to sell but I need some money right now for school. I paid Norm(Venice Beach) $2,000 for the bike with a 2 stroke motor. I later added the 99cc engine when the 2 stroke stopped working and decided to make it reliable which is why I used the 4 stroke. I am located in Southern California let me know if you have any questions I will not part it out and not sure I will be able to ship the bike either.
 

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1100 is good for that bike but why do you want to sell it? That thing is perfect. Not too much power to break stuff like a 212 but enough to move and you never need to mix gas like all those crappy 2-stroke bicycle engines.

In any case you won’t sell it now maybe when spring comes.
 
Yeah I've been debating about selling it. It's very reliable and simple but I will need money coming up this summer. I will have to pay for school fee's around $2K so I have to start selling off some stuff. If I can get the money on my own by the next couple months I will decide to keep it. I'm currently not working because of school but I am doing odd jobs here and there on my free time.
 
Oh and the oil stains on the floor are not from this motorbike(this bike does not leak oil its perfect). My other motorcycle leaks some oil and so each time I park it there it stains the concrete.
 
Bluck, got to ask as I have searched long and hard.
The billet finless flywheel which I presume will fit a 79cc.
Where did you source it from?
Tom
 
Tom from Rubicon said:
Bluck, got to ask as I have searched long and hard.
The billet finless flywheel which I presume will fit a 79cc.
Where did you source it from?
Tom
Click to expand...

It will fit a 79cc predator engine but I actually bought the engine from someone on the motorbikes forums. I really wanted a 99cc and not a 79cc it was the only one I could find from him. He said he had someone custom make it for him. It is not a billet flywheel though. It is aluminum on top of the stock iron flywheel. With the original fins removed. It has two slots to pull start the bike. I can get a hold of the guy hopefully he can respond if you're interested.
 
bluck said:
It will fit a 79cc predator engine but I actually bought the engine from someone on the motorbikes forums. I really wanted a 99cc and not a 79cc it was the only one I could find from him. He said he had someone custom make it for him. It is not a billet flywheel though. It is aluminum on top of the stock iron flywheel. With the original fins removed. It has two slots to pull start the bike. I can get a hold of the guy hopefully he can respond if you're interested.
Click to expand...
Thanks but I'll pass bluck, my concern is a grenading the cast iron flywheel. First thing I did to the 79cc was remove the governor.
 
Tom from Rubicon said:
Thanks but I'll pass bluck, my concern is a grenading the cast iron flywheel. First thing I did to the 79cc was remove the governor.
Click to expand...

Won’t happen on stock springs. Rod typically goes first. Unless you just enjoy the act of spending money... nothing wrong with that my 5yo niece loves spending cash more than getting stuff... laff
 
Heavy springs are ordered. Pat recommends decking the head to increase compression also. The bench engine will get upgrades. Thanks for the reply Tony01.
 
Tony01 said:
Won’t happen on stock springs. Rod typically goes first. Unless you just enjoy the act of spending money... nothing wrong with that my 5yo niece loves spending cash more than getting stuff... laff
Click to expand...
I remember reading that someone I think under the name Tony? not sure. He had someone make him a custom billet rod and he was able to rev his 99cc engine without any worries. He had pretty crazy builds and had many years of building bikes under his belt. I would personally want a rod then the flywheel. Sounds expensive if only I had the money lol.
 
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