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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » starts but won't accelerate / rev up

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1Back to top Go down   starts but won't accelerate / rev up Empty starts but won't accelerate / rev up Fri Apr 15, 2016 10:32 am

Tony goodwin

Tony goodwin
active member
active member
Starts fine  all else seems fine. Just won't rev up . Bought it like this . Any suggestion?

    

92KK 84WW Olaf

avatar
Life time member
Life time member
Hi Tony

Don't be afraid to ask questions, we all had to start somewhere on these and sometimes the question you don't ask is the one that causes you trouble.

If bike is starting AND ticking over ok you may well have an issue with the throttle cable having come awry inside the handlebar mechanism. Clearly you are getting fuel and spark so don't go chasing in there just yet. The handlebar mechanism has a chain inside it that needs an occasional lube and if incorrectly maintained you can end up with..........no throttle. If you can see the other end above the injector rail you will see where the cable ends and there is an adjustment screw/stop where it rests at idle. You should see this lift when you turn the throttle. If it doesn't, use your finger to see if it lifts and if it does lift fire up the engine and do it again. If it revs for you then check out the handlebar mechanism.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Can you describe what it does in lieu of revving up when you twist the throttle?


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

charlie99

charlie99
VIP
VIP
sounds like a fuel pressure thing

in no particular order ...fuel filter , pump , pressure regulator , could be an afm issue as well ?

I would try disconnecting the throttle position switch first off ...I think we saw a similar issue here before .


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

Rick G

Rick G
admin
admin
Check the air filter it's a great place for rodents to nest Quite likely it's full of something else other than air filter, that is if the little buggers haven't eaten it as well.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

Tony goodwin

Tony goodwin
active member
active member
92KK 84WW Olaf wrote:Hi Tony

Don't be afraid to ask questions, we all had to start somewhere on these and sometimes the question you don't ask is the one that causes you trouble.

If bike is starting AND ticking over ok you may well have an issue with the throttle cable having come awry inside the handlebar mechanism. Clearly you are getting fuel and spark so don't go chasing in there just yet. The handlebar mechanism has a chain inside it that needs an occasional lube and if incorrectly maintained you can end up with..........no throttle. If you can see the other end above the injector rail you will see where the cable ends and there is an adjustment screw/stop where it rests at idle. You should see this lift when you turn the throttle. If it doesn't, use your finger to see if it lifts and if it does lift fire up the engine and do it again. If it revs for you then check out the handlebar mechanism.

    

Tony goodwin

Tony goodwin
active member
active member
The cable is operating fine checked and lubricated. I think it may b fuel or air flow related. I couldn't start it this time round . Battery died and I'm puzzling to find where iv stashed my battery charger . Getting old I guess

    

Holister

Holister
Life time member
Life time member
Could be a poor response from the FICU due to low voltages from a bad battery.
If your battery has died I'm guessing your charger won't help one bit. If it measures less that 12.0V across the terminals its most probably cactus. Buy a sealed AGM battery around 25Ah and about 280-300cca

Failing that I'd replace the AFM with a good secondhand unit.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808		 starts but won't accelerate / rev up Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

Rick G

Rick G
admin
admin
I believe the Bosch ECUs wont work if supply voltage is below 9v so the not starting may just be that when you have tried to start with a low battery the ECU just isn't working and not faulty.
To me this is looking like a low fuel pressure issue. Probably pay to check the pressure. Best quick check is to hold your thumb over the outlet and the pressure should be enough to push your thumb away or be very hard to stop the flow and make sure theris a good flow back to the tank from the return line.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

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