BMW R100T engine racing

[wigy]

Hello I ride a trike with a BMW R100t engine .
The engine starts Ok first time.
Tick over is Ok.
When the engine gets up to working temperture the rev counters hoovers around 2 to 3000 Revs, With the throttle fully off.

Any advise would be helpful.

Many thanks.
Wigy :( :( :(

[hmmmnz]

are you running the original bing carbs??

any way my guess is that you have an air leak, either pre or post carbs,
with the engine running spray some wd40/crc etc around the carb area, if the revs change then its definitly an air leak,

but it may be that use just need to adjust your idle, or that your choke circuit is sticking
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[wigy]

Hi Many thanks

I will try that out and ordere som new seals/ Rubber washers one thing Iforgot to put on my main message was that the plug on the left hand side has started sooting up.

Wigy.

[wigy]

Missed off yes I am using th original Bing Carbs 40mm.

Thanks.

[tatters]

Faulty auto advance only happens when the engine is warm, its located in a small can under the front engine cover below the crank (mechical advance arms and hall sensor). dont bother trying to lube the arms just replace it or send it off to the likes of motobins for repair.

I,ve just replaced mine with a enduralast eletronic system before such a thing happned to mine.
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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

[wigy]

Hello I'm back I have Fitted new hose connections from the head to the carbs/ Fitted new ' O' Seals to the air mixture,
What I have now discovered is that it's only the one Carburetor causing the problem, When the engine gets hot the Engine revs high,
When I put a cloth over the end of the open cab the Revs reduce to normal and then increase when I remove the cloth. I am lost what to do.

Help PLease.

[tatters]

I,ve already told you what the problem is 99% likely to be, There is nothing wrong with the carbs and you are wasting your time playing around with them.

I,ve done over 100kkm on R100,s and currently riding one around Morocco and l know the 2-valve boxer engines like the back of my hand, your auto advance unit is faulty.

https://www.gunsmoke.com/motorcycling/r100gs/auto_advance/index.html

https://www.motorworks.co.uk/bmw/prodimages/lg/ELA44088.jpg

https://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=20&Ct=IA&SbCt=BA_15_20_IA_20&spPage=2
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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]

+1

I had a R100 engined dnepr outfit.
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Some shite cruiser. Now with guns and FREEDOM!

[temeluchus]

+1

I had a R100 engined dnepr outfit.
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Some shite cruiser. Now with guns and FREEDOM!

[wigy]

Hi I have taken the front cover off the engine,
I do not have the the can you show in your picture,
Mine has still got the points with the condenser attached to the side,
I have tried to post a picture but the system tells me its to large to transfer.

[tatters]

If Engine is running points its a earlier pre-1980 /7 engine (opps missed the "t" on r100) but the issue is the same that the ignition is not being advanced. either try adjustment or a overhaul of the unit, l believe the points cams need lubing on theses ones and can stick unlike later canister type it can be lubed.
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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

[wigy]

Many Thanks I will try that out.

Wigy

[temeluchus]

[spyuggy]

A little check you can try is to remove the tops off the carbs and check the diaphragms, I had the R80rt and had a similar problem, it cured it for me, as one of the diaphragms was goosed.
Good luck mate.
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Treat each day as if it was your last, because one day you will be right.

[wigy]

Hello I would just like to say many thanks for all the advise i was given, Engine now running sweet and tidy.

It was the advance behind the points that was causing the issue, Reason I left this until last did not feel confident to repair also my manual for the BMW does not show these weights either so I was totally confused.

At last back on the road many thanks again.

Wigy