BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Throttle bodies binding Empty Throttle bodies binding on Sat Jul 14, 2018 9:08 am

@kustom_moto

@kustom_moto
Silver member
Silver member
Guys, hoping you can help. Please see photo, the throttle bodies never quite return to normal idle, even with the throttle cable removed. I have oiled all the moving parts, springs etc but still it never quite returns to normal idle! Super annoying as I am so close to final tuning with the Carbtune. Really grateful if anyone has any ideas please!

Throttle bodies binding 20180710


__________________________________________________
1988 K100 LT
1984 K100 RS

Instagram K100 Build follow me at: @kustom_moto
    

2Back to top Go down   Throttle bodies binding Empty Re: Throttle bodies binding on Sat Jul 14, 2018 9:22 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Check the clips on the rubbers are not interfering with the mechanism being able to return. I did have that happen and ended up with high idle.

You can lift it up and feel for what's happening, look at each one as its easy to have something interfere with it. This one is important. Also check th the tend where the throttle position sensor is located.

Also check its all well lubed. [You have done this]

Second place is to look at the handlebar chain mechanism, may need clean and lube and a stiff throttle can be a sign. [cable disconnected and still happening puts this off the list for now]


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now91,850 miles
1983 K100RS 0011175 Fricka 29,495 miles Damn K Pox
    

3Back to top Go down   Throttle bodies binding Empty Re: Throttle bodies binding on Sat Jul 14, 2018 9:47 am

@kustom_moto

@kustom_moto
Silver member
Silver member
You are a genius!!! You got it it was the throttle position sensor. As soon as I loosened the 2 screws the whole throttle assembly freed right up!!! Do I need this sensor?


__________________________________________________
1988 K100 LT
1984 K100 RS

Instagram K100 Build follow me at: @kustom_moto
    

4Back to top Go down   Throttle bodies binding Empty Re: Throttle bodies binding on Sat Jul 14, 2018 10:40 am

robmack

robmack
Life time member
Life time member
Some people eliminate the TPS and report having smoother engine deceleration characteristics. It does perform a useful function for the FI system so I'd recommend leaving it in place. Just make sure it is adjusted properly.

- The TPS should click just off idle
- the TPS has to be aligned precisely with the TB shaft. Yours wasn't. Once you get the off-idle adjustment correct, shift the TPS side to side to ensure it is aligned.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

5Back to top Go down   Throttle bodies binding Empty Re: Throttle bodies binding on Sat Jul 14, 2018 11:08 am

@kustom_moto

@kustom_moto
Silver member
Silver member
Thanks guys. It almost feels like the brass shaft is slightly too long because the sensor doesn't fit 100% flush, could this be possible?


__________________________________________________
1988 K100 LT
1984 K100 RS

Instagram K100 Build follow me at: @kustom_moto
    

6Back to top Go down   Throttle bodies binding Empty Re: Throttle bodies binding on Sat Jul 14, 2018 2:16 pm

robmack

robmack
Life time member
Life time member
Highly improbable, but there could be something inside the hole for the shaft that is preventing it from being fully seated. Inspect the TPS and look for any obstruction. If none, then install and adjust the TPS. Tighten the screws holding it to the TBs and test the throttle. If it continues to be sticky, then maybe shim out the TPS with washers.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum