its got me puzzled

bansheedave

bansheedave

Active Member
Nov 4, 2010
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well, i got the blaster moving. since my bike will be down for some time, i decided, screw it, to cut the chain and fit it to the blaster. i cobbled it up to run it under its own power. well, free reving the motor is fine but it sure lacks in first gear. it was jetting way to rich on the main and needle. i dropped the main from 178 to 168 and put the clip second from the top. it runs a bit better. also, i know the reeds need changing and the top could use freshening up and the cluch might need to be replaced but still, it bogs down in first and than begin to pick back up before i run out of room. you all think i should just rebuild the motor first or could it be just the nature of the beast being a 125?
 
ill check that out, i need to pull the carb and check the pilot jet anyways. i forgot what was in it and i lost my cheat sheet that had everything written down on.
 
cant even get it to do a burnout without bogging down and dying....lol at least not a decent one
 
It is only a 125.. No way to do a plug chop huh? still may be rich.. What's your gearing btw?
Ohh and you leak tested right? o_O I cant remember so ill ask, is this a PV motor? If so is it clean and no spooge (the pv) , if its not closing right it wont get the exhaust pulse it wants for low end.. I believe you know that though..
 
Last edited:
the gearing is 13/40 The power valve works. I made sure of it and had to buy new oem parts to make it work correctly since the PO lost parts. I didn't leak test for one reason, sealing up the power valve actuating system is nearly impossible. I will give it a shot. I will pull the cover off and run it to be sure this weekend or next week since im off work.
 
I never rode the bike prior to the swap, but I doubt it ran right than either. it didn't have a kill switch, the airfilter was covered in dirt and black. the fuel line was held on with duct tape.
 
speedyslyder said:
it is a huge difference to the size of the rear sprocket,how many teeth is the original like 50?
Click to expand...
The smaller tire size should have made up that difference.

Didn't you modify the pipe to fit? If so, give some details on what you did, that might be the issue

As to leak-down: Just did an 89 RM250 and wanted to blow my brains out over it. BUT I did still find a leaking reed gasket and small leak at case split between reed flange/box and cyl bottom (case reed induction, reeds not on cylinder). Trans vents through PV, couldn't get good seal on ex port, yada yada.
 
the only thing i did to the pipe to get it to fit was cut the flange off and rotated it and welded it back on. i also tweaked the pipe slightly to gain a little extra clearance. i had to cut the back out of the main chamber to rework the pipe back into shape due to it was crushed and welded it back up. i will try to perform a leak test on it. . wont be easy, but if i can seal the valve actuating arm up somehow, it should be good. .
 
I was mostly concerned if you did any major change to the shapes or length of the pipe.

Good luck on the L/D. Not knowing how that CR is, but you might be like I was as far as where and how much it leaks. I had one screw on the PV cover that leaked, and can't easily access with eng in frame.
 
Did the leak down. found the power valve cover to be the only leak. fixed that. no change. adjust the float, something happend when i did that so i changed the float all together. i put in a smaller pilot jet, wejt from 55 to 45. it ran like crap. put the 55 back in. when i first took the carb apart, i found debi and water in the float bowl. not good. cleaned it all up. it runs good now. i knew the 125 would have a weak bottom end, but damn, this has none.
 
took the blaster out to my moms for a quick run threw the yard and road. granted, it isn't ready for actual abuse but as long as I can feather the clutch, she gets up and moves. it like to spin the stock blaster tires without a problem. it swapped ends in the road with ease.
 
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