sira Posted May 20, 2015 Author Share Posted May 20, 2015 Friends Since I brought this bike plug 1 is dark and other are ok (white tip) so tried to do few tune-up and finally same issue. I also dismantle the 4 carbs and cleaned again last week but same issue. The jest was on 1,2,3 may have mixed with each other (4th carb jet and needle is different and it did not mixed up) during this process even thought 1,2,3 mixed with jets and needle , still 1st plug is dark. what cause of this issue? no miss fire, no wobbling, could it be valve issue? please advice Quote Link to comment Share on other sites More sharing options...
Rumesh88 Posted May 21, 2015 Share Posted May 21, 2015 (edited) As far as I can remember needles are the same for all four but corner jet (No. 4) is different but that too by a small margin. What is a the difference you observe in the needle (diameter, shape, length..)? Usually these needles (made of an alloy to reduce weight) get worn out very quickly and that's one of the reasons for its bad reputation on fuel consumption and difficulty in synchronizing. Other thing that can happen is the loss of tension (or resilience) in the rubber diaphragm. It cannot be an issue with a valve cos', if so, you should have observed a noticeable wobble at low revs. Edit: Get the No. 4 carb tuned using a color tune kit. That should solve the problem. Edited May 21, 2015 by Rumesh88 Quote Link to comment Share on other sites More sharing options...
Shehan_WCC Posted May 25, 2015 Share Posted May 25, 2015 If you did purchase this bike second hand, you would not know what most "maka basses" have done to your carb, most of them replace the jets off a CD125 carb as i recall. Quote Link to comment Share on other sites More sharing options...
nsiva Posted May 25, 2015 Share Posted May 25, 2015 On 5/21/2015 at 3:28 AM, Rumesh88 said: As far as I can remember needles are the same for all four but corner jet (No. 4) is different but that too by a small margin. What is a the difference you observe in the needle (diameter, shape, length..)?Usually these needles (made of an alloy to reduce weight) get worn out very quickly and that's one of the reasons for its bad reputation on fuel consumption and difficulty in synchronizing. Other thing that can happen is the loss of tension (or resilience) in the rubber diaphragm. It cannot be an issue with a valve cos', if so, you should have observed a noticeable wobble at low revs. Edit: Get the No. 4 carb tuned using a color tune kit. That should solve the problem. If the carburettor is VP03- then follow this diagram: Quote Link to comment Share on other sites More sharing options...
nsiva Posted May 25, 2015 Share Posted May 25, 2015 Sorry couldnt upload the photo. It says for VP03 carburettor - #1-#3 cylinders : #88 #4 cylinder: #90 That is from the service manual in japanese. Quote Link to comment Share on other sites More sharing options...
sira Posted May 28, 2015 Author Share Posted May 28, 2015 Thank you guys Quote Link to comment Share on other sites More sharing options...
Tharika Posted March 2, 2017 Share Posted March 2, 2017 #sira i have same problem at the honda jade 250. Are you found the solution for these problem????? Quote Link to comment Share on other sites More sharing options...
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