electrical problem

[goodstich44]

Hi
David here. I'm new on here so be gentle! About 5pm last night, I was overtaking a car doing about 65mph when my Mastiff just cut out completely. I dragged the clutch in of course and coasted to a halt, just avoiding being written off by the car I'd just overtaken! When I tried the ignition, Nothing! not a light. I'm hoping its just a main fuse blown or wire come off somewhere? I parked it up safe in a house fairly near where it happened (after pushing up a very steep hill) and will go and try and sort it out today. Any ideas why it happened?, is this common on these? I've only had the bike a couple of months. Low mileage almost immaculate 2002 red mastiff.
Thanks for any help.

[DAVID THOMPSON]

check this link
viewtopic.php?f=4&t=2085

there are diodes in the wire harness that work this relay as well
if one goes bad it makes the side stand switch not work proper
if you hit a bump just before going dead it may be side stand
and do check the kill switch on right handle bar

also i have had a problem with fuses of late there very poor quality
dave

[goodstich44]

Hi David

Thanks very much for your fast reply. Got back to the bike yesterday with a few tools, took the seat off and found the terminal holding the positive lead on the battery had sheared in half! So that's all it was. I cut the positive lead just behind the bit of terminal that was clamped very hard on the lead and jammed the bared positive lead in to the connection, tightened it up best as I could and it got me home. Just vibration caused it to shear I think?

Two more issues I'm concerned about. The ignition barrel is lose so needs tightening to avoid a possible disaster mentioned on another post. Do you need a special tool for this?. Also, this issue of the nut coming loose on the balancer shaft. Is this usually a high mileage thing?. Though my bike's a 2002, it's only done 7000 miles and is close to immaculate. I've only recently got it, so really didn't want to spend money on it already, but will of course if it means saving a lot of money on a knackered engine if that nut comes off?

David.

[DAVID THOMPSON]

loose balancer shaft. nut is the product of I THINK of bad driving habits
wheelies stoppies winding the motor up too high or lugging it

my bike is setting till i can get too it.. but the fellows befor me change and modified so much stuff
on the bike i think i need to change mine to be safe

[Chalks]

A'up David (welcome aboard) and David (hello again),

I thought that wheelies, stoppies and winding the motor up too high was normal for a Baggy/Mastiff, isn't that why they
were made? Surely it's a Yamaha design fault, building and engine that can't cope with such normal conditions that caused the
nut to come loose. They should have had a chubby bird (or bloke if you're that way inclined) on the production line, to swing
on a 22 inch crack bar with some permanent thread locking compound to prevent imminent failure
Check out this link and nip it in the bud. (Trust the knowledge of the old timers and feel the force young Yedi).
viewtopic.php?f=3&t=6478&hilit=goes+bang