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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » Throttle not returning fully closed!

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eman-nyc

eman-nyc
active member
active member
Helppp...
Recently i have replaced intake manifolds on my K100 and finished vacume test. Now i have an issue.
After i finished the sync the throttle wont return closed, the idle adjustment screw doesn’t hit its perch unless I physically push it down. When i let go it returns to opened about 3-4mm. The idle is to high (1500-1600 rpm). Anyone knows how i can fix this?

    

eman-nyc

eman-nyc
active member
active member
Here is a video...

    

Inge K.

Inge K.
VIP
VIP
Check the lower hose clamps relative to the throttle mechanism.
If OK, check the adjustement of throttle position switch.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

duck

duck
Life time member
Life time member
Ditto on the TPS possibly holding it open.  Been there, done that.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

club_c

club_c
Life time member
Life time member
Inge K. wrote:Check the lower hose clamps relative to the throttle mechanism.
X2. Don't ask me how I know...


__________________________________________________
"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

Dai

Dai
Life time member
Life time member
And here...


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

92KK 84WW Olaf

avatar
Life time member
Life time member
club_c wrote:
Inge K. wrote:Check the lower hose clamps relative to the throttle mechanism.
X2. Don't ask me how I know...

I found this was a problem on my K100LT by a previous owner, the hose clamps were preventing full closing.....just opened and rotated them clear.


__________________________________________________
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 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 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
    

smoll1

avatar
Silver member
Silver member
I had same with throttle position sensor. Had me scratching my head for a while.  Very Happy

    

duck

duck
Life time member
Life time member
smoll1 wrote:I had same with throttle position sensor. Had me scratching my head for a while.  Very Happy

When I ran into this it was after I replaced the throttle body boots.  I'm pretty sure that what happened is that I pushed the top of the TPS back without realizing it when I shoehorned the plenum above the TBs back into place.

(My only claim to fame in K bike world is that I've probably screwed up more things on K bikes than anyone else on the planet.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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