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  #1  
Old 06-19-2013, 07:56 PM
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Default 84 cr250r kicking back

well.. first off im new here and new to dirt bikes. i bought a 84 cr250 for 180 bucks in pieces. had a headgasket leak and 120 compression and real bad kickback.. so rebuilt the most of the motor. put new rings gaskets freed the clutch up cause it wasnt working. it has brand new stator and coil. put it all back together runs and rides pretty good pops the front wheel up easy. when i first started it a few times after the rebuild it didnt kick back my timing hasnt moved ive chec.ked twice. but my foot is black and blue from kickback. the motor is bored .60 over and ported and has a 155 main jet. if that helps. i have the stator on the factory timing mark... i dont have a dial indicator to tell wher tdc is to adjust it... and dont have the money for one. what could it be? maybe im just missing the trick. cause sometimes it starts first kick.
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  #2  
Old 06-19-2013, 08:48 PM
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Default ????

What gas are you using?

Paw Paw
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Old 06-19-2013, 09:46 PM
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I know this may be WAYY off track but perhaps try retard the timing just a fraction. It can't harm to try it, beside, you know you can always go back to factory.....
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Old 06-20-2013, 06:48 AM
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im running premium with klotz pre mix. i think 32:1. to retard the timing which way do i turn it. like i said i dont have a dial indicator.
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Old 06-20-2013, 07:01 AM
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Default OK

OK, with the stator cover removed...
Push down on the kick start and watch the flywheel rotation. Move the stator plate in that same direction to retard the timing.

Paw Paw
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Old 06-20-2013, 08:40 AM
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Only retard a FRACTION at a time as this sort of adjustment is very fine....if you retard too far you may have issue in the higher rpms....

---------- Post added at 11:10 PM ---------- Previous post was at 11:09 PM ----------

I may be mistaken but when you adjust the port timing I can only think that the ignition may need be adjusted very slightly(??)
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Old 06-20-2013, 08:56 AM
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Default Also

Also if the heads squash band was not recut to match to new overbore you could be causing a slight pre-ignition issue as well.

Paw Paw
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  #8  
Old 06-20-2013, 10:10 AM
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Quote:
Originally Posted by PawPaw View Post
Also if the heads squash band was not recut to match to new overbore you could be causing a slight pre-ignition issue as well.

Paw Paw
are u talking about the metal ring on the head gasket. cause i did buy just a regualr kit
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  #9  
Old 06-20-2013, 10:22 AM
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Default No

No I am talking about the actual head. The squash section is right where the outside edge of the head meets the cylinder. It's about 1/4" wide and should be recut when ever an over bore is done. If not you fuel mixture can have too much compression right on the edge of the piston and do damage.
Here is a video showing the squish band on another engine. Look at the head.

[Only registered and activated users can see links. ]

Paw Paw
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  #10  
Old 06-20-2013, 11:46 AM
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well i dont know if anything was done to is as i didnt bore it over it came to me like that... but i dont think anything was because i dont remember seeing anything done like that to the head... ive already takin motor down twice (because there was a bad ring). and really dont feel like doin it again. so im gonna try to adjust the timing first and if that doesnt work ill try after i can afford to buy more gaskets..
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Old 06-20-2013, 11:59 AM
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Default Ok, but!

Ok, but you may burn up a piston if it is not correct and then what will you do? It's better to fix it correctly first.

Paw Paw
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Old 06-20-2013, 05:51 PM
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well i dont plan on riding it for a couple weeks if i can get the money i will.. just asking if it was damaging the piston wouldnt i be able to hear it?
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  #13  
Old 06-20-2013, 06:29 PM
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Default No

No, it may not make contact with the piston, but rather just be giving it too much squeeze and can damage the piston on the edges and cause the rings to sieze. When that happens you can screw up your cylinder and head.

It just one of those silly little things that many folks forget about when they modify their engine and then wonder why it did not last. Anytime you modify and engine there are many things that have to be checked and corrected to make it last. It's one of those "pay me now or pay me more later " type of things.

Paw Paw
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  #14  
Old 06-20-2013, 08:34 PM
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is there a way i can do it at home or just have to send it off? im limited on money... i dont have a whole lot of money into it. and i heard the 84 was a bad year cause of the water pump and right side clutch case cracking... so because of that i dont want to dump a huge amount at it..and it is my first bike...by the way thanks for all the info..
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