Steve Butters Posted July 25, 2009 Report Share Posted July 25, 2009 just got a yz125... its in great condition for its year, its been worked a bit... 50 over with wiseco piston, fires easy etc....fired it up and it started reving to the moon like it was gonna explode... pulled the carb off and one of the floats had broken off in the past, and instead of soldering it back on, the person put a screw in it...so the float was filling up causing it to run like piss...im in the process of buying new floats for it, the needle and stuff all works good so im thinkin once i fix the float ill be ok.... does that problem sound float related? or should i check anything else out while the carb is off?also, what all maintenance should i do before riding it? ive got crankcase oil, coolant, spark plug...anything else im over looking? and tips in general for a 2 stroke bike? ive never been on one, just 4 strokes... i traded my nintendo wii for this bike lol so im ok with it havin some problems Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 26, 2009 Author Report Share Posted July 26, 2009 for shits and giggles Quote Link to comment Share on other sites More sharing options...
Whitey1 Posted July 26, 2009 Report Share Posted July 26, 2009 Hell get some jb weld and slap it back together! A bike beats a video game any day of the week!Only advice I have is use good 2 stroke oil mixed right and have a blast! Quote Link to comment Share on other sites More sharing options...
Likwid Posted July 26, 2009 Report Share Posted July 26, 2009 lol niceCheck valve clearance? Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 26, 2009 Author Report Share Posted July 26, 2009 never worked on a bike sorry if this is a dumb question, but how hard is it to check valve clearance? Quote Link to comment Share on other sites More sharing options...
Whitey1 Posted July 26, 2009 Report Share Posted July 26, 2009 never worked on a bike sorry if this is a dumb question, but how hard is it to check valve clearance?Two stroke engines do not have typical valves like 4 strokes. They have an inlet valve aka reed valve. Do some google searches and read up a bitabout your bike and 2 strokes. They are really easy to work on. They tend to need rebuilt more often but it is cheap and easy. Have a blast, the two stroke power on those little 125 is addicting. You go from a no torque at all wimpy bogg, to screaming as pulling power in a blink of an eye! Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 26, 2009 Author Report Share Posted July 26, 2009 Two stroke engines do not have typical valves like 4 strokes. They have an inlet valve aka reed valve. Do some google searches and read up a bitabout your bike and 2 strokes. They are really easy to work on. They tend to need rebuilt more often but it is cheap and easy. Have a blast, the two stroke power on those little 125 is addicting. You go from a no torque at all wimpy bogg, to screaming as pulling power in a blink of an eye!rebuilt as in? idk how many more times it can be rebuilt lol its already 50 over Quote Link to comment Share on other sites More sharing options...
Whitey1 Posted July 26, 2009 Report Share Posted July 26, 2009 rebuilt as in? idk how many more times it can be rebuilt lol its already 50 overI am sure you can get a new jug or even put a sleeve in it. lol Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 26, 2009 Author Report Share Posted July 26, 2009 I am sure you can get a new jug or even put a sleeve in it. lolhope to just avoid all that lol...it fires right up and seemed to run good for a few mins before the carb acted up Quote Link to comment Share on other sites More sharing options...
ReconRat Posted July 26, 2009 Report Share Posted July 26, 2009 (edited) short answer: Yes, a bad or jammed float would make it rev sky high.Oversize rebuilds usually are in increments of .25mm up to 1mm. For a small piston, anyway. So two more overbores, I suppose. Often the bore can be honed and fresh rings used, without going oversized again. So you have more than two rebuilds left on the motor.edit: You do know you have to mix oil with the gas for that engine, right? Somewhere between 1:20 ratio and 1:32 ratio would be about right. Check the manual for details. Not motor oil, this is lube oil for mixing with gasoline.http://www.yamaha-motor.com/sport/apparel/apscitemdetail/3/121/all/1/7462/detail.aspxhttp://www.dansmc.com/2stroke_oil.htm Edited July 26, 2009 by ReconRat earl Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 26, 2009 Author Report Share Posted July 26, 2009 short answer: Yes, a bad or jammed float would make it rev sky high.Oversize rebuilds usually are in increments of .25mm up to 1mm. For a small piston, anyway. So two more overbores, I suppose. Often the bore can be honed and fresh rings used, without going oversized again. So you have more than two rebuilds left on the motor.edit: You do know you have to mix oil with the gas for that engine, right? Somewhere between 1:20 ratio and 1:32 ratio would be about right. Check the manual for details. Not motor oil, this is lube oil for mixing with gasoline.http://www.yamaha-motor.com/sport/apparel/apscitemdetail/3/121/all/1/7462/detail.aspxhttp://www.dansmc.com/2stroke_oil.htmthanks...i know what oil to use, but wasnt sure on mixing gas yet... im gonna buy a repair manual for it and ill check the exact number in there...it was outta gas today, and i put a half gallon of whatever mix my gfs dad had for his chainsaw in it...just to fire it up Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 28, 2009 Author Report Share Posted July 28, 2009 can i mix gas in a can and let it sit? the manual with the bike says not to mix more than im going to use in one day and to dispose of the remaining fuel...ide like to mix about 4 gallons at a time, and it will probably be 2-3months before i use all of it (bike is at my gfs house, and i dont really have anywhere to ride except at her place) Quote Link to comment Share on other sites More sharing options...
wrillo Posted July 28, 2009 Report Share Posted July 28, 2009 (edited) if its going to be 3 months or so then you might want to add a fuel stabilizer to the mixture, but I don't see any reason why you couldn't do that. I doubt the oil will stay suspended in the gasoline very well, so best give the can a stir before each use Edited July 28, 2009 by wrillo Quote Link to comment Share on other sites More sharing options...
Steve Butters Posted July 28, 2009 Author Report Share Posted July 28, 2009 ok thanks Quote Link to comment Share on other sites More sharing options...
magifesq Posted August 6, 2009 Report Share Posted August 6, 2009 1:20 - 1:32, that thick I've had it foul out plugs, 1:40 - 1:50 is usually where I go Quote Link to comment Share on other sites More sharing options...
max power Posted August 6, 2009 Report Share Posted August 6, 2009 You got a 1984 YZ with a manual? Sweet. Have fun on that thing. Quote Link to comment Share on other sites More sharing options...
yotaman88210 Posted August 6, 2009 Report Share Posted August 6, 2009 I run 32:1 in my 85 no foul plugs yet... im runnin u4.2 tho. I love me some 2stroke Quote Link to comment Share on other sites More sharing options...
John Posted August 6, 2009 Report Share Posted August 6, 2009 yota, you probably are on the pipe a lot too though eh? not just putting around the yard or whatever?the way i understand it is that the 1:32 provides adequate lubrication for riding hard in the upper RPM range, on the pipe most of the time. like during a race. after all, this IS a race bike when you are just putting around in the yard, 1:32 is too thick for those low RPM conditions and you can start to foul plugs, so you should run a little thinner mix if you are not riding hard.i could be mistaken about that though, im sure someone on here will straighten me out if i am Quote Link to comment Share on other sites More sharing options...
siggywiggy Posted August 6, 2009 Report Share Posted August 6, 2009 i run 32:1 in a 87 125. It may be rich and smoke a bit but better to be rich than too lean and burn a hole through the piston. rebuild the piston and rings after every year or two of riding depending on hours. make sure all the bolts and screws are tight. bikes of that edge tend to lose shit once in a while Quote Link to comment Share on other sites More sharing options...
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