Engine Earth Strap - Gen 1 Fazer - Running Voltage

[BSR67]

Chaps

Is there a engine to frame earth strap? And if so, where is it located?

The battery negative attaches to the start motor mount.

I am getting 13.5v at 5,000 rpm across the battery which feels low. Normally charging systems are 14v+

So, cleaning up contacts/connectors. Battery to starter strap is good. Need to check the other .... if it's there.

Thanks

BSR67


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Yes mate, the ground from battery does indeed run direct to starter motor, which is really a balls up on Yamaha's part.
Front engine mount to frame is rubber damped, so no ground there, only part of motor that's in direct contact with the frame is the rear mount & since the frame & motor are factory painted, there's likely little grounding going on there either, amazes me these old Yams run at all.

It'll pay dividends to add a new copper ground from battery direct to a bare metal point on the frame, lights will work better too as they're pretty dog shit at best, also running a heavy gauge ground from headlamps direct to battery will improve current flow to lamps even further, it's an old copper loom that's well past its best, a better ground is an instant cheap upgrade, charging will be optimised too, minimal cost & time for big benefits, no brainer, testing as is will likely result in poor/incorrect result.

Thanks Gaz66

I'll buy a new earth secondary strap and add.

I did some work cleaning up the plug from the generator to the loom, and loom to R/R. The latter was a little crusty but not awful. I managed to get the voltage to about 13.7/13.8v and on removing the headlight fuse, 14v. But, when raising the revs it dips to 13.5v so suspect regulator. I've bought a used FZS600 one as a benchmark/check which is on the way. I've also bought an generator cover gasket so I can pull the stator and check impedence.

There are no issues with the running of the bike, or charging etc. It's just 'annoying'! I'd expect to get 14v plus at the battery ....

I have in the past upgraded a formerly owned VFR800 VTEC plus my son's GSR600 with an FH020A Mosfet which pumps out 14.4v.

Thanks

BSR67