Idle rate dropping when fan starts- now fixed

[Chris750]

Bike: 1995 GSXR 750ws

I have got the idle rate set up exactly as it specifies in the manual.

1200 (+ or - 100).

This is great but when I am at a standstill and the fan starts up, the idle rate starts to drop off significantly, to the point where I have to keep blipping the throttle to avoid a stall.

This is quite annoying and doesn't strike me as being something normal.

Anyone got any idea as to the cause?
____________________
Current Rides: GSXR-750 WS, GSXR-1000 K5, KTM EXC 300

[P.addy]

Up the idle to 1300 when its warm?

Its stealing juice from your bike to spark AND spin a fan, seems to be stealing loads

[Chris750]

[Howling TerrorOutOfOffice]

Is the battery charged? Even if the regulator/rectifier is functioning properly it would be drawing power for the battery.
Spin the fan by hand..checking for worn bearings or fan blades catching.
Is your rev counter reading correct? [how to check this i don't know...i go by ear...if it sounds like a BSB bike it's too high and if it chugs like a harley it's too low kinda thing....all very technical stuff]

Wish i could confuse you more.
____________________
Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project

[Chris750]

[Walloper]

I was just about to suggest that you put an ammeter between the supply and the fan.
If the motor is shorting it will be drawing massive amounts of load.
Maybe even plugged by something in the blades.
____________________
W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[dextersaurus]

On my TT600, i had the same thing. fan would kick in and the bike would drop to ~700rpm, but wouldn't stall, just sounded horrid.

When i got the cable to check the error codes, it turned out to be a short in the fan's wires. quick check of these and i found the problem.

Best bed i'd say is check there. also check the quality of your HT leads/plugs... even if the battery is okay, if the plugs or leads are rubbish the problem's gonna stay.

Dunc

[Chris750]

This has been fixed.
I also started to notice running issues when it was wet outside in addition to when the fan was on.

It turned out to be a faulty HT lead which was split and sparking to the frame.
This had a noticable effect when there was extra load on the electrics or in the wet.

I have replaced all leads and changed the plugs now and it is running really well.

Thanks for everyones help.
____________________
Current Rides: GSXR-750 WS, GSXR-1000 K5, KTM EXC 300

[Howling TerrorOutOfOffice]

Stored in the memory bank...Check HT leads.
____________________
Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project