1979 KX250 hard to start


5 replies to this topic
  • fujioko

Posted June 06, 2008 - 04:12 AM

#1

Hi ‘ya folks,

I recently picked up a ’79 KX250. After riding the bike, I decided it was not practical for my trail riding (way to fast). The bike is currently on ebay.

Anyway the bike is a real pain to start. I put in a new NGK plug and it still is a pain. I ended up using my huge power drill with a 13MM socket and spinning the engine over to get it to start reliably.

The bike will actually start better using a spark plug from my ’50 ford tractor. I speculate the shorter plug decreases the compression enough to allow the CDI to fire (assuming the CDI is failing). Does this sound correct?

Also, anyone know the correct gap for the NGK?

Thanks

  • Fatback

Posted June 06, 2008 - 08:23 AM

#2

id do a compression check first. thats an old bike, and who knows what the top end is like.

a bad top end will be very hard to start, as you said was your problem.

  • shrubitup

Posted June 06, 2008 - 03:12 PM

#3

dump a tsp of pre mix into the cylinder with the stock plug. this will give better ring seal and increase compression to make it start easier. this is the poor mans top end rebuild trick.

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  • Jeekinz

Posted June 06, 2008 - 03:37 PM

#4

Shoot.

If you were closer I'd buy that in a heartbeat.

Is it hard to start after it has been run already?

  • ineedhelpmeplz

Posted October 29, 2014 - 03:21 PM

#5

dump a tsp of pre mix into the cylinder with the stock plug. this will give better ring seal and increase compression to make it start easier. this is the poor mans top end rebuild trick.

Hi what do u mean by that im having the same problem i just bought the dirt bike for 150 and it is kinda easy to kick, turnover i was wondering what can i do to help it start also i read that u put the oil in the gas but i found a oil thing do i still put it in the gas? here are a couple questions:

Hi i just bought a 1979 Kawasaki KX250 dirt bike i was wondering i found a place were u put oil in, i read that ur suppose to put oil in the gas do i still do that? Also its kinda easy to kick over is that good or bad? and when i start it do i keep the choke up or down? and for the compression test what is the range suppose to be? Thanks For Your Help....
here are some pics of the engine
http://postimg.org/image/m249pgce7/
http://postimg.org/image/ntph8ofel/
http://postimg.org/image/sf8tjf7ev/



  • shrubitup

Posted October 29, 2014 - 05:32 PM

#6

Hi what do u mean by that im having the same problem i just bought the dirt bike for 150 and it is kinda easy to kick, turnover i was wondering what can i do to help it start also i read that u put the oil in the gas but i found a oil thing do i still put it in the gas? here are a couple questions:
Hi i just bought a 1979 Kawasaki KX250 dirt bike i was wondering i found a place were u put oil in, i read that ur suppose to put oil in the gas do i still do that? Also its kinda easy to kick over is that good or bad? and when i start it do i keep the choke up or down? and for the compression test what is the range suppose to be? Thanks For Your Help....
here are some pics of the engine
http://postimg.org/image/m249pgce7/
http://postimg.org/image/ntph8ofel/
http://postimg.org/image/sf8tjf7ev/

The filler cap located near the clutch cable shown in pic 1 and pic 3. Put in 800ml of 10w30 or ATF. This is for your transmission and clutch. Put in four ounces of two cycle oil per gallon of gasoline. This is a mixture ratio of 32:1. Drain your transmission oil first tho.

Most importantly, YES you still need to put oil in your gas. Verify your reeds are in good condition. Clean the carburetor or buy new jets if possible. Six year old thread lol.

Edited by shrubitup, October 29, 2014 - 05:59 PM.






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