Semi-First Razz Thread

[yamadave]

Hey everyone. I have been lurking around here and decided to join, this forum looks to have a wealth of information and nice people.

I just picked up a Razz today off of craigslist for $200. Cosmetically, it is pretty rough, but everything on it works well. I noticed it was running lean on the way back from buying it, so I pulled the carb to clean it out and found that the air boot that goes to the carb wasnt even connected! It had been off for a while apparently, because the boot had already had enough time to shrink and harden to the point of not being able to reconnect it. I hope the PO didnt run it for too long like this, as this was making it run really lean.

I went ahead and pulled the carb and cleaned the main and pilot jets really well and sprayed all of the other orifices out with carb cleaner. The thing had an 84 jet already in it! Isnt that a bit big to begin with for a 50cc? Well anyway, to alleviate the airbox issue I upped the main jet size to somewhere around a 120 and it runs awesome without the airbox on it. It runs well enough that I am a 210 lbs rider and it will go about 35mph on straightaways with the throttle being responsive enough throughout the entire RPM range. I am putting a high flow pod airfilter on it tomorrow. If any of you want, I can get back into the carb and let you know the exact jet size that was used.

I figured Id add this to the forum because I have been reading about a lot of speed issues with this particular scooter not being able to get over 25, and I think I might have found a quick fix for some of you looking to get a little more for less money. Everything else on the scooter is stock from what I can tell. Going down hills I peg the speedometer and the motor seems happy to rev.

I was expecting to find a belt drive, but after my friend who owns a local scooter shop told me it had a chain instead it made me curious enough to drain it to see what was behind it. The chain setup going to crosscut gears definitely surprised me, why would Yamaha want to go with a weird setup like this? Seems kind of limiting to me, but they probably werent thinking performance when they designed this model, but instead less maintenance for the user. The only parts I see needing to be replaced after time would be the clutch shoes, and the springs when they soften up a bit. My buddy had some stiffer springs lying around his shop so we went ahead and replaced them while we had the cover off. It made a nice improvement on the takeoff.

Well anyway, I hope I can contribute some of my experiences to the forum and learn a bit from it as well. Most of my experience is with motorcycles, both 2 and 4 cycle, but I think that they will tie in with scootering pretty well. I have 2 other motorcycles, an 85 Honda VF700S and an 81 Yamaha XS400 cafe racer Im in the process of finishing up.

[yamadave]

Update on the main jet size I used. It was a 105, not a 120. Somebody must have slipped something into my coffee yesterday.