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Old 17-10-11, 07:14 AM   #6
Sid Squid
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Location: Skunk Works, Nth London
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Default Re: Throttle Position Sensor

Quote:
Originally Posted by saintnick View Post
Looking at that thread, I reckon that disconnecting a TPS on a carbed bike would simply leave the ignition at max advance and thus have no negative implications.
Could be - I've never measured that, but as for no negative implications, I disagree, as said it's essentially a load sensor - there's no question it will run without the sensor/sensor set wrong, but it's definately better with it set correctly, it's not the difference of pulling a plug lead off, but there is a difference.
Quote:
Originally Posted by saintnick View Post
FI bikes may respond differently to bypassing the sensor since FI and a TPS work hand in hand (in theory).
FI system work very differently - but the TPS is still a load sensor in the same way - of course it also does other things too.
Quote:
Originally Posted by saintnick View Post
That's why I was surprised to find that carbed SVs employed a TPS in the first place: not many carbed bikes did.
Many late carb bikes of my knowledge do, mostly from the mid 90s forward.
Quote:
Originally Posted by saintnick View Post
It's an interesting one because some carbed SVs are a little unusual in that they can be jumpy when bringing power in, say exiting a bend
This is why - not withstanding your obvious careful attention to the carburation - I'm thinking that something else is possibly the problem, SVs are neither notably smooth or notably rough, by what measure do you feel that the bike is not right? I appreciate this is difficult to express in a forum post.
Quote:
Originally Posted by saintnick View Post
If anyone has bypassed on a carbed bike, I'd be interested in where you unplugged the thing.
If you wished it disconnected then at the sensor is as good as anywhere else.

TPS setup, (from Suzuki's own workshop manual):

Looking at the end of the connector you will see it is roughly heart shaped, there are three pins, two next to each other at the wide end, and one at the narrow end, call the the single pin at the narrow end 'A' and the upper left hand one 'B' and the right hand one 'C'

Throttle shut - 3.5 - 6.5 K-ohms between 'A' and 'B'
Throttle open - Resistance between pins 'A' and 'C' should be 78% of the resistance of the resistance between 'A' and 'B'.
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