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Post by dragan on Nov 23, 2014 18:08:48 GMT
Hi to all. I clean the carbs and balance them I unscrew the mixture screw 1 3/4 out (b12 mk1).I ride the bike couple of days and I take out the spark plugs today this is the pic.I think it needs more fuel and I have to unscrew the mixture screw more??  |
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Post by dragan on Nov 23, 2014 18:09:46 GMT
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Post by katana on Nov 23, 2014 18:36:05 GMT
Mixture screw only affects idle & v.low speed operation! Does appear lean so either needle profile / position needs changing or MJ, although most peeps don't ride around long enough on full throttle to achieve a decent plug chop / reliable plug colour! Dyno it - do it properly!
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Post by dragan on Nov 23, 2014 18:48:03 GMT
We dont have Dyno in my City so wath should I do??? Shuld I open the mixture screw more( how meny turns) or not??
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Post by captain chaos on Nov 23, 2014 19:00:08 GMT
lift the needles one notch.
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Post by dragan on Nov 23, 2014 19:13:31 GMT
The needle is set on the second gruve from up.
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Post by oilyspanner on Nov 23, 2014 20:55:59 GMT
Have to agree with the other guys, the plug looks too pale, it needs to be a tan colour. We spend most of our time riding around on the needle, so the colour reflects the mid-range setting.
Did you mean second position from the top Dragan ? - if so put the clip in the middle position, this will lift the needle and make this slightly richer.
The mixture screw helps when the revs stay slightly high when the throttle is blipped, or when the bike is hesitant when cruising along at a small throttle opening (when it's lean in the first 1/8 throttle).
I like your signature line Captain Chaos ! the great John Robinson - a journo/engineer who really understood how things worked - I've got 2 of his books - if he wrote something you had to believe it - R.I.P. JR
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Post by dragan on Nov 23, 2014 22:06:54 GMT
Thanks my friends for the responde I will put the nidle on the middle notch and we will see wath happens.
Dragan.
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Post by dragan on Nov 23, 2014 22:37:20 GMT
Have to agree with the other guys, the plug looks too pale, it needs to be a tan colour. We spend most of our time riding around on the needle, so the colour reflects the mid-range setting. Did you mean second position from the top Dragan ? - if so put the clip in the middle position, this will lift the needle and make this slightly richer. The mixture screw helps when the revs stay slightly high when the throttle is blipped, or when the bike is hesitant when cruising along at a small throttle opening (when it's lean in the first 1/8 throttle). I like your signature line Captain Chaos ! the great John Robinson - a journo/engineer who really understood how things worked - I've got 2 of his books - if he wrote something you had to believe it - R.I.P. JR And I forgot to mention when the bike is hot and I rev the rpm are droping normal approximately thil 2500 than thay stop there and after some seconds thay drop to Normal.is this because the mixture screw?? |
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Post by oilyspanner on Nov 24, 2014 0:25:59 GMT
Sounds lean on the pilot mixture screw, back them out another half turn and see if that helps - if you need 3.5 turns out you might need the next size pilot jet.
Good luck OS
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Post by captain chaos on Nov 24, 2014 11:44:21 GMT
I like your signature line Captain Chaos ! the great John Robinson - a journo/engineer who really understood how things worked - I've got 2 of his books - if he wrote something you had to believe it - R.I.P. JR JR understood very well the art of explaininging something complicated so it sounds simple. |
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Post by wsn03 on Nov 24, 2014 15:18:00 GMT
My Bandit 1200 Mk1 is on 2.75 turns out - this seems to be perfect.
I have tried many settings, and balanced the carbs.
This setting seems about right. I may move my needles one notch to get rid of the mild surge I get when I open the throttle at very low rpm....
Pilots are critical for touring - when you are cruising at constant speed (especially in controlled speed restricted areas) they will affect the smooth running of the bike as you're mainly running just off the pilot jets.
Make sure you have new spark plugs, most running issues actually stem from the spark plugs on Bandit - don't ask me why? They have an extremely short life, and I find all manner of issues are solved by renewing them regularly.
The two critical things to smooth running - balanced carbs, new plugs in my experience.
Hope that helps
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Post by captain chaos on Nov 24, 2014 17:24:08 GMT
The two critical things to smooth running - balanced carbs, new plugs in my experience. Hope that helps and valve clearances set correctly |
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Post by dragan on Nov 24, 2014 17:26:41 GMT
Ok mates I will put the needle on the middle notch and I will turne the mixture screw 2.75 turns and me god help me  Dragan. .the spark plugs are new. |
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Post by wsn03 on Nov 24, 2014 21:38:01 GMT
Ok mates I will put the needle on the middle notch and I will turne the mixture screw 2.75 turns and me god help me Dragan. .the spark plugs are new. As Captain Chaos says set your valve clearances - it's an easy job if you have the right tools (box spanner, 2 x hex spanner, feeler gauge), but critical to smooth running also. MAKE SURE YOU PUT A RAG INSIDE - I didn't, and when trying to remove the rubber gaskets for the spark plug cavity I dropped 2 copper washers inside the engine..............ffs!! Had to strip the engine. Keep the whole thing covered so nothing can fall inside. |
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