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Old 07-12-2019, 12:31 PM   #1
Maddevill
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Clutch switch question

Hi, My friend has a Gen 2 , 2005 S model. He's got a bad clutch switch. If he jumps it with a paperclip the bike starts and runs fine. I understand that as long as the paperclip is in there the ECU will be feeding extra fuel in the warm up mode.
What happens if he removes the paperclip ? The bike continues to run but will the fuel mapping be ok?
He wants to ride tomorrow.

TIA

Mad
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Old 07-12-2019, 02:49 PM   #2
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Re: Clutch switch question

The extra fuel goes away after 3500? rpm even with the switch jumped, so it would be easier to leave the paper clip in place than to remove it and try to reinsert it every time you need to start the bike.
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Old 07-12-2019, 04:07 PM   #3
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Re: Clutch switch question

It can make hot starts problematic, and around town it impacts fuel usage noticeably. Switches are cheap.
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Old 07-13-2019, 06:02 AM   #4
RecoilRob
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Re: Clutch switch question

The sad thing is the clutch switch...besides acting as a safety device also alters the fueling and jumping it out can cause stalling from reports. The thing that gets me is that the engine absolutely does not need the changes the clutch switch makes to the fueling....mine has been eliminated and fuels the same switch in or out and it runs fine. This must have been something related to emissions during decel as the maps for switch in and out are different for sure. It's nice to have tuning devoid of emission constraints.
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Old 07-13-2019, 01:40 PM   #5
AkiraNakayama
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Re: Clutch switch question

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Originally Posted by RecoilRob View Post
The sad thing is the clutch switch...besides acting as a safety device also alters the fueling and jumping it out can cause stalling from reports. The thing that gets me is that the engine absolutely does not need the changes the clutch switch makes to the fueling....mine has been eliminated and fuels the same switch in or out and it runs fine. This must have been something related to emissions during decel as the maps for switch in and out are different for sure. It's nice to have tuning devoid of emission constraints.
Wait, so which year SV do you have then? TeeRiver did that video where you clearly see the injection pulses change with the switch engaged/disengaged. I actually eliminated (jumped) my clutch switch but then decided to go back because I didn't want to deal with the fuelling changes.
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Old 07-13-2019, 04:27 PM   #6
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Re: Clutch switch question

And is there a difference between 650 and 1000 FI maps
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Old 07-14-2019, 07:13 AM   #7
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Re: Clutch switch question

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Originally Posted by AkiraNakayama View Post
Wait, so which year SV do you have then? TeeRiver did that video where you clearly see the injection pulses change with the switch engaged/disengaged. I actually eliminated (jumped) my clutch switch but then decided to go back because I didn't want to deal with the fuelling changes.
Sorry....didn't mean to confuse, my ECU is running altered tuning via Woolich Racing kit and has no gear maps or clutch in-out....all gears run the same program and it runs well. The weird fueling the stock SV does is due to the emission programming built into the tune. If the tuning is stock then you really should run the clutch switch. Even if you correct the fueling via clutch switch it should be left in place as a safe guard IMHO.
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Old 07-14-2019, 09:15 PM   #8
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Re: Clutch switch question

I thought you could do a proper bypass by cutting the wire that goes to the ECU? Black with yellow tracer or yellow with black tracer?

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