Question about Honda CR 125 R Motorcycles

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Put new piston and ring in. Motor will not start. gas is not getting from carb to motor. Somebody told me to check reed valves. somebody else told me that the low end seals are bad. help

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What Honda do you have, model, year and cc?

Posted on Sep 01, 2010

  • tombones Sep 01, 2010

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3 Answers

I have a 1980 rm125 it does not start it just back fires


usually a 2 stroke will chuff/backfire out of the exhaust if it low on compression, did you put the rings in the right grooves and up the right way and is the piston in the right way around as there is a front and back ,the ring pegs are supposed to face the inlet side of the barrel.

Feb 15, 2015 | GAS Motorcycles

1 Answer

I have a 07 kawasaki ninja ex250 I have put a new motor in. It is turning over and cranking but blowing out a ton of smile bluish white meaning oil out of my exhaust. Aswell as in my air filter. I have...


By "new" motor, do you mean "another" motor removed from a different bike? I can't imagine a brand-new motor acting like that. I suspect that you used a salvage engine that was worn out or damaged internally, especially since you checked the compression (you probably wouldn't have done that if the engine was brand-new).

Inasmuch as this is a salvage engine, it MAY simply have been sitting idle so long that the rings are rusted in the ring grooves and need to be freed up by running the engine for a while. Do whatever you can to get it started (this may take quite a lot of doing), then let it idle for several hours to free up the piston rings again.

Jul 30, 2014 | Motorcycles

1 Answer

Will not compress air


If while running the air pressure in the tank comes up (watch the tank pressure guage) but then leaks out after the pressure switch turns the motor off, you need to check/replace the tank check valve. If the motor runs and runs and the tank pressure never comes up or gets over 30 to 40 psi you need to check: cold start valve if it has one; piston/ring/cylinder condition; valve plate reeds. Any of these will contribut to you not getting enough pressure in the tank for the pressure switch to turn the motor off.

Jan 30, 2012 | Air Tools & Compressors

1 Answer

Will not build pressure past 40 psi


You have either damaged reed valves or piston ring. Both of which are common problems with this type of compressor. To diagnose: Remove the motor cover, then the four screws holding the cylinder head on. The valve plate is under the head and all eight reeds, five intake and three output, must be in very good condition to work properly. You'll need the valve plate, part number N017592, and head gasket, part number Z-D24819, if there are any damaged reed valves. If they're OK, check the piston ring. Remove the screw holding the piston on the flywheel and pull the con-rod out of the cylinder. The ring around the piston must be in perfect condition to build pressure. The connecting rod kit, part number KK-4964, is the only way to get the piston seal ring.

Jan 17, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

If i fliped my jey ski the wrong way how do i fix it?


If you have a water drain knob for draining the crankcase (Kawasaki 2 stroke motor) ,pull the knob and drain the water. As long as you have not turned the motor over you are OK. Get the motor started and run it long enough to dry it out. If you filled the motor with water, turned it over and now it wont run, you probably have broken the reed valves. You will have to pull the carburetor, check the reed valves, and dry out the motor as quickly as possible. Be sure to fog the lower end as quickly as possible so the crank bearings and piston needle bearings do not rust. Replace the broken reeds, put the carb back on, and you should be back in business.

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3 Answers

Kx 125 reed valves


The reed valve assembly should hold solvent withot leaking. Remove for test. Disassemble and clean reeds and reed seat. Perfect seal is very important.

Good luck,
Techjoel

May 17, 2009 | 2003 kawasaki KX 125

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