What have I got here, SY50MP

keithw · Post by **keithw** » Sun Apr 27, 2008 11:49 am

I recently picked up a truely beat little scooter. Thought it was a Spree, however, it has a kpm speedo and looks to be a SY50MP. The engine number is AFO5E-7725xxx. So it looks like a Spree motor but the serial number is way too high. Did a google search and only found hits in Japan and New Zealand so I presume it's a JDM model. Does anyone have any info on this thing? What parts fit?

keithw

chevyguyjay · Post by **chevyguyjay** » Sun Apr 27, 2008 2:56 pm

um, show us some pics. then we can go from there.

keithw · Post by **keithw** » Sun Apr 27, 2008 6:57 pm

Here are links to pics.

http://datsunroadsterranch.com/images/scooter1.jpg

http://datsunroadsterranch.com/images/scooter2.jpg

http://datsunroadsterranch.com/images/scooter3.jpg

http://datsunroadsterranch.com/images/scooter4.jpg

Hopefully it won't be too hard to get bits for. The general plan is to: Get it running, Jet it to run E-85 (105 octane, and cheap), Start shaving the head. Also quite likely a tuned pipe, porting and trans work along the way. It was free and I don't plan to spend much on it. Should be fun.

keithw

Dac · Post by **Dac** » Sun Apr 27, 2008 7:25 pm

you have a weird bike my friend.

i dont know what the * that thing is, but its not from the states.

Ill ask a few people on other sites and see if they can help find out what you got.

looks to me like a japan version of a 89 elite. Im not sure though.

If you could snap a pic of the stock tail pipe. I have never seen a belt case like that before, it could be like a dio motor. The tail pipe will tell for sure.

MySpree · Post by **MySpree** » Sun Apr 27, 2008 7:32 pm

its a 89 sb50 but the jap version of it

Dac · Post by **Dac** » Sun Apr 27, 2008 7:33 pm

MySpree wrote:its a 89 sb50 but the jap version of it

whats up with the funky belt cover?

keithw · Post by **keithw** » Sun Apr 27, 2008 8:00 pm

Been rooting around the internet. It might be a Pal. Keep coming across them in New Zealand. Thanks for the help and hopefully someone can help with some info. Unfortunately the entire exhaust system is missing.

keithw

mopedman · Post by **mopedman** » Sun Apr 27, 2008 11:44 pm

yea ive seen these befor don't they have the same engine as a 1989 elite

tru72 · Post by **tru72** » Tue Apr 29, 2008 2:34 am

it is a pal...
very nice find

keithw · Post by **keithw** » Sat May 17, 2008 9:28 am

I decided to finally work on it a bit yesterday. Been busy and just didn't get to it sooner. Took the carb off and cleaned it. Cleaned a bunch of dirt and oil off the engine. Hooked up a battery and it fired right up. Someone had monkeyed with the carb and the idle mixture was way rich. The rear wheel is bent, some of the body panels are missing and some are broken. Took it out for a ride and the speedo indicated 30k/pm, about 20mph. It's running well enough that I'll go ahead and put it back together. First I need to find an engine fan and fan shroud. The shroud is missing and the fan is mangled. It sounds like it is running lean so I need to find carb main jets. So far I'm pretty happy with it. Still thinking about modifying it to run E-85 but I need to sort basic things first.

keithw

Post by **noiseguy** » Sat May 17, 2008 3:28 pm

I'd be interested in knowing how much you need to increase the jet size to run E85.

Kenny_McCormic · Post by **Kenny_McCormic** » Sat May 17, 2008 5:24 pm

Im guessing somewhere between 80 and 100. Air screw should be in as far as possible.

keithw · Post by **keithw** » Sat May 17, 2008 11:23 pm

Running E-85 will have it's own problems. You don't want to let it sit in the carb for long as it will eat it up. I'm thinking pull the vacuum line to the fuel valve and let it run dry when parking it overnight or open the float bowl drain.

keithw

po89mm · Post by **po89mm** » Sun May 18, 2008 12:04 am

just a guess, but i think you have a honda

keithw · Post by **keithw** » Sun May 18, 2008 9:19 am

Reminds me of a story. An older person goes into a bike shop to get a part for their kids bike. The parts counter person asks what model. The customer is somewhat surprised to find there is more than one model, in fact there are dozens and dozens. The next day they come back and report happily that it is a "Honda".

Yes, it is a Honda. Looks to be a JDM Pal. The tail light and turn signal lenses look to be entirely different, and are broken. Haven't been able to track down the year yet.

The exhaust was a cobbled together aftermarket mess. I cut off the head end flange and the muffler. Then took some 3/4" EMT and did some bending, cutting and welding. Looks a little redneck but way better than it did.

My friend who is an old school 2 stroke guy rode it and says it's rich on the top. I'll check into getting jets for it. First priority of course is getting the fan and shroud sorted.

keithw