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Good going! Glad you got it sorted out.

If you go into the parts break down on the Roketa site for the 250 Bali it specifies a front tire size of 120/70-12. That is what I replaced mine with and it is fine.

www.roketa.com/product/parts_detail.jsp?partId=23417&partName=STEERING%20ASSEMBLY%285%29

Before I changed my rollers I was only able to top out at about 6000 RPM's unless I was going down hill. I picked this one up a couple of years ago for $165.00. It had a rough life with it's previous owners. The compression isn't as high as I would like it to be but it always starts and runs.

I suppose if I wanted to I could try removing every other weight. Try it with tree 6 gram weights in the variator. That would give me a total of 18 grams as opposed to the 24 grams in there now.

Some people like to drain all of the gas out of them and put the battery on a trickle charger. I like to start mine every week or two and let them warm up good for 20 minutes or so. I put a couple of ounces of "Sea Foam" in the tank to help clean and prevent varnish build up in the carb. When the weather drops below freezing I do use a trickle charger on my batteries. I keep mine in an unheated garage. I also ride them while it's cold out, just not when it's wet.

Yes it is OK to use synthetic oil in GY6 engines. I would wait until it is broken in though. Somewhere between 600 to 1000 miles IMHO.

If your engine has the vertical cylinder adjust your valves this way: scooterdoc.proboards.com/index.cgi?board=power&action=display&thread=5025

If your engine has the horizontal cylinder adjust your valves this way: scooterdoc.proboards.com/index.cgi?board=power&action=display&thread=5032

The starter bendex (pinion) gear might be broken or it may just need to be lubricated. Here is a link to a manual. www.hondaspree.net/other/Spree_NQ50_84-87_1.pdf