Grand Prix 250
Main Motorcycle: Depends on the day......
Join Date: Dec 2010
Location: South Africa
Other Motorcycle: 1920,35,55,56,66,69,97,..
Extra Motorcycle: 00,02
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I have had a stalling/quitting bike for some time so I changed just about everything BUT the CDI box. The problems went away for a while but then came back recently. It happens more when the girlfriend is on the back but sometimes when Iím riding solo as well. Iím 200 LBS and girlfriend is 120.
Wow, truly overwhelmed with the awesome support and generosity of this forum. Sorry for the late response I just got back from work. Iíll try and sort all of these suggestions and questions out here:
Over the last 2 months I have replaced and changed a few things. I live in hot humid south Florida. I have had a stalling/quitting bike for some time so I changed just about everything BUT the CDI box. The problems went away for a while but then came back recently. It happens more when the girlfriend is on the back but sometimes when Iím riding solo as well. Iím 200 LBS and girlfriend is 120.
For the problem of the bike just dying, turning off mid-ride (as described above) I will try the last thing I have not done yet, which is putting some rubber gaskets or washers under the rubber bumpers under the seat to raise it off the CDI ( I had previously cut a hole out of the underside plastic of the seat for the CDI box and thought that would be sufficient in case the seat was putting pressure on it but since that did not work, I will now go the extra step and try lifting the seat as well.) This doesnít bother me as much as the new problem because the bike always started back up even mid ride on the highway while cruising at 70 mph... itís dangerous but it didnít happen that often and I tried so many fixes that didnít work so I thought I would just have to live with it.
BUT the NEW problem and even more concerning one is the one I started this thread with. It is the non-response of the throttle while riding. Sometimes as some here have mentioned, the bike jerks haphazardly, and other times it is just completely non responsive. I donít know why or how long it does it for and it seems to be completely at random as far as I can tell. I twist the throttle a few times maybe for 30 seconds (As the bike is slowly decelerating and running) as I coast over to the side of the road and then just as mysteriously as it stopped responding, twisting of the throttle works again and off I go.. Very dangerous and odd. Please note with this problem the bike does NOT turn off. The RPMís are around 1000 as when idling.
Here are some of the recent things I have done to the bike if this adds any color to the problem to help.
Sealed and Relined gas tank
Cleaned petcock and all parts
Cleaned fuel filters
Changed spring for kick stand
Changed carb screws for other hex stainless steel ones
Changed front and rear brake pads
On both brakes I bled and changed fluid
Changed Gasket around pick-up-coil cover
Cleaned carburetor float bowls and pilot jet and main jet and float bowl drain screw
Re-oiled and lubed all bolts and screws
Cleaned manifold and air box rubbers
Cleaned air filter
Sand papered gas tank fuel valve neck to get rid of pain chipping
Sealed and relined gas tank with caswells to get rid of rust
Replaced spark plug boots with nology ones
New spark plugs
Took off SAIS with conversion kit
Does that help with suggestions?
Thanks again for everyone who has helped. Iíll try just about anything at this point..
I can try some things as soon as tomorrow. All I want is a reliable bike and have never had one... very frustrating.
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