inazuma
Oviraptor
Posts: 17
Bikes: GSX 1200 Inazuma, GSXR 1100 street
Reg: Jul 19, 2013 14:25:59 GMT
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Post by inazuma on Jul 21, 2013 21:25:01 GMT
I need help to set up mikuni rs 38 I fit DOT head in b12, run on mikuni BST 36 preaty much well. So I start setting mikuni RS 38. Set as should be, main 135 pilot 17,5 idle 2nd form top, fuel level 17mm. Been balanced. Running terrible at low and mid. I discover that mixture screw at 1 whole out improve reaction at low rev... But worse thing is that it stops at hi revs and very slowly drops. I's pretty scary when it hangs at 6tou at 3nd gear and it don't want to stop. Any suggestions ?
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Post by dago on Jul 22, 2013 20:59:35 GMT
have you fitted a push/pull throttle as these carbs have been known to stick open due to the air pressure on the slides . also you might need to go up a size on pilots and raise the needle the factory settings are just a starting point and usually not far out
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inazuma
Oviraptor
Posts: 17
Bikes: GSX 1200 Inazuma, GSXR 1100 street
Reg: Jul 19, 2013 14:25:59 GMT
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Post by inazuma on Jul 24, 2013 6:50:29 GMT
I use only pull throttle, thought that spring is strong enough... OK, I try some of that.
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Post by Devilman on Jul 24, 2013 13:49:29 GMT
I had a lot of problems with rev's hanging up and misbehaving like you describe with a set of BST carbs. Turned out that the inlet rubbers were leaking air past the O-ring seal between the head and the rubber. Its worth a look, I spent days trying to chase fueling issues that turned out to be air leaks and bad sync.
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Post by gs1168 on Jul 25, 2013 1:03:54 GMT
does sound like a vacuum problem. also the intake ports need to be 'opened up' to work with larger carb boots on dot head. using dot head intake boots? or later/larger boots? if you mount them and look in the port you can see what you have to remove. this will cause a reversion effect, intake charge back into carbs, especially at lower rpms.
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inazuma
Oviraptor
Posts: 17
Bikes: GSX 1200 Inazuma, GSXR 1100 street
Reg: Jul 19, 2013 14:25:59 GMT
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Post by inazuma on Jul 25, 2013 22:00:00 GMT
Good point. I try really hard to fit proper way inlets including silicone. The higher revs are the slower revs drops. Nightmare... still fighting.
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Post by jonny on Aug 1, 2013 0:02:13 GMT
Try pilot screw 2 1/2 turns out.
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Post by duckndive on Aug 1, 2013 4:19:52 GMT
Push / Pull throttle is the way to go......does say so in the manual.... i alos had 155 mains.....on a similar set up.................
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inazuma
Oviraptor
Posts: 17
Bikes: GSX 1200 Inazuma, GSXR 1100 street
Reg: Jul 19, 2013 14:25:59 GMT
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Post by inazuma on Aug 1, 2013 15:20:24 GMT
I've go back to 1/4 turns out. Getting close but still slowly revs drops. Maybe it's the way they work? They are my first flatslides I use, and I don't have the experience.
Could that be result of too poor mixture? 155! ok 137,5 but 155?
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Post by dago on Aug 1, 2013 20:26:41 GMT
revs hanging up means mixture is lean try turning screws out 1/8 at a time till drops back quick ,or set with colour tune or vac gauges, as for mains all bike are different even with same setup but could put you a lot closer
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Post by duckndive on Aug 2, 2013 4:25:19 GMT
I've go back to 1/4 turns out. Getting close but still slowly revs drops. Maybe it's the way they work? They are my first flatslides I use, and I don't have the experience. Could that be result of too poor mixture? 155! ok 137,5 but 155? You asked and i did have stacks and not filters But every bike is different..
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Post by kokolis on Aug 5, 2013 18:31:43 GMT
Hi, first check cable for free movement,137.5 mains with dublex filters are too small, 150-155 is more like it. Check for faulty air, set mixture screws 2 out, on working temperature, let her idle, then turn screw on no 1 in till rpms drops a bit then turn the screw out a full turn, try that on all cylinders, keep in mind that all mixture screws have to have the same amount turns out.
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inazuma
Oviraptor
Posts: 17
Bikes: GSX 1200 Inazuma, GSXR 1100 street
Reg: Jul 19, 2013 14:25:59 GMT
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Post by inazuma on Aug 9, 2013 16:41:27 GMT
And yes It's lean! I raise slowly to 144 mains and It's not the same bike, better respond, revs drops. Very happy biker I'm now. Try bigger mains soon, see what comes out. Thanx all.
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Post by gpz1100convert on Aug 12, 2013 19:11:27 GMT
When mine used to drop revs slowly with rs 36's on I found it was the carb rubbers not sealing. try a smear of sealant and pop them back on. cleared my problem up fine
Mark
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Post by dago on Aug 13, 2013 18:07:44 GMT
you should start rich 155 and work your way down to avoid the risk of engine damage from running weak
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