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  #1  
Old 03-18-2014, 07:38 PM
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Default 97 cr250 jetting

     

I have a 97 cr250 that I need some input on the jetting. it has a 55 pilot and 175 main with a I think 1368 needle 3rd clip position. im at about 500 to 600 feet. it can be 50 to 60 out and it will start without choke. after riding and getting it hot it wont idle unless I turn the idle up but if I do it it kind of idle surges. if it cuts off its a real pain to start again I have to give a little throttle while kicking and do it at the right spot to start it again. any one have any suggestions for me?
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Old 03-19-2014, 08:03 AM
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Too rich. You need to adjust your jetting leaner.
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Old 03-19-2014, 09:30 AM
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First check your float height, then move on to jetting.
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Old 03-19-2014, 10:10 AM
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Yes!!!! I put this down to a leaky float needle (possibly worn) and incorrect float height. Chances are you haven't done any carb maintenance recently. I'd recommend a rebuild kit to replace the old O-rings and gaskets, check the float needle...if you feel perdantic replace the float ........
Set your jets to stock and see where you at, please give us a plug reading.
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Old 03-19-2014, 02:45 PM
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the plug is wet around the threads but has a whitish greyish tint around the electrode and ground strap
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Old 03-19-2014, 03:56 PM
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The white indicates your are running lean... ( Possible air leak)
The Wet indicates either you have a leaking crank seal or your top end needs rebuilding.
What does a compression test show?
When was the last top end done?

Paw Paw
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Old 03-19-2014, 04:15 PM
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I just bought the bike not long ago so I don't really know when the last time the top end was done. when I did the compression test I had 180psi.
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Old 03-19-2014, 05:36 PM
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Ok, so the compression is good. How hard do your ride it? If not hard yet then you may be collecting excess fuel mix in the crankcase cavity and thus the wet plug. If you ride it hard then the plug tells me you have a leaking crank seal or seals.

Paw Paw
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Old 03-19-2014, 07:52 PM
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I'm new the the 2stroke/dirt bike game so its normally a mixture of easy and hard riding. I don't have a very large area to really ride and open it up. I can normally get through 3rd and most of 4th gear before I have to stop.
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Old 03-19-2014, 08:50 PM
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I'm still thinking your running rich, if it's starting without the choke and not idling when hot....
With good compression I think you can put bad crank seals aside....
But that white plug says otherwise???
Hmmmm
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Old 03-19-2014, 10:15 PM
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Check around intake leaks around carb and reed block...maybe ur pilot jet is rich and ur other jettig is lean. Hence the easy start but lean reading
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Old 03-20-2014, 12:53 AM
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^ good point with the pilot jet. Perhaps try adjust the air/fuel screw too...
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Old 03-20-2014, 07:20 PM
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i tinkered with it a little bit today. I put the needle clip in the second position and dropped the 175 jet to a 172. still starting without choke I took it up the road wide open and pulled the clutch in while hitting the kill switch. pulled the plug and its still has a whitish tint to it. I started with the fuel mixture screw all the way in turning it out 1/4 turns each ride and nothing changed till I got about 2.5 to 3 turns out and the electrode had one small speck of wetness on it.

---------- Post added at 06:20 PM ---------- Previous post was at 06:00 PM ----------

when I got the bike it had a 1468 needle in it. would that needle be better than the 1368?
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Old 03-20-2014, 09:05 PM
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If the issues are on start up, you may want to look at the idle jet. I'm around sea level and run a 48 and it's a bit rich.
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