BMW R100 Carb balancing

tatters · Exxon Valdez Joined: 04 Jan 2004 Karma :

Bit of a rare one me asking for help Laughing

But......have any of you lot got any experience balancing carbs on Air cooled BMW,s or a vacuum gauges that l can borrow as my Carbtune II does,nt seem to like the stock CV bing carbs on my BMW.

located in surrey and really need to get this sorted by next Tuesday. Thumbs Up

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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

One method is to put alot of slack in the throttle cables and then take out one sparkplugs. Then adjust the bike to idle on one cylinder. Then swap plugs and set it to idle with the other cylinder.

Then with both you will get a high idle, you adjust the idle down with equal turns on the idle speed screw. THEN adjust the slack in the throttle cables to be equal.

That should get things fairly well adjusted.
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Some shite cruiser. Now with guns and FREEDOM!

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

oh an make sure you earth your sparkplugs when they are out-if you have an electronic ignition unit, it wont like having ungrounded sparkies!
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Some shite cruiser. Now with guns and FREEDOM!

tatters · Exxon Valdez Joined: 04 Jan 2004 Karma :

Cant do it that way on the later CDI/hall sensor engines as it can fry the CDI, found a specialist near me hopefully he can help.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

its fine as log as you earth the sparplug.

Get a length of wire and bare 2 inches off one end. Wrap this around the threads on the sparkplug. Bare the other end and attach it to earth-screw it down on the frame or motor somewhere. That will prevent the igniton being damaged.
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Some shite cruiser. Now with guns and FREEDOM!