[Tekn0Sapein]

So used Multi but new to me... Had it to dealer for desmo, service, etc. and to get everything set to tolerance as soon as I bought it. Still issues starting it. Brand new Yuasa AGM battery, still issues starting it. It will crank and crank and crank.... but won't start. Bump the throttle here and there and it might kind of 'burp' but still nothing. Tried more throttle till it floods....

Slap the jumper cables on it and 3 or 4 cranks it starts. What am I missing?!?! I know these bikes were/are notorious for being a finicky start but my old ST4S cranks twice and fires right up.

TIA

 

[BOTT]

I hear a piggyback set of battery cables on top of the OEM cables does it.
Where I would get a heavy set of car jumper battery cables. Attach to said polarity, meaning, follow the (+) battery cable to plus battery post, then the jumper to follow the plus cable to the starter relay. Then the ground clamped to the negative battery post, and that jumper cable ground to the engine or frame. Better the engine, being the starter motor is the ground to the engine, loophole the frame for now.

Say it starts like the ST. Now swap the ground from engine to frame. Bike starts like the ST. That says the original complaint is a ground to frame problem.

This narrows it down to refreshing the OEM cables to show shinny bare metal, and scrape the frame's ground area clean to shinny metal as well.

Fires off like the ST or complaint? Fire right off. Then you don't need the piggyback cables, it was a ground to be freshened up.

Make sense?

 

[Tekn0Sapein]

I hear a piggyback set of battery cables on top of the OEM cables does it.
Where I would get a heavy set of car jumper battery cables. Attach to said polarity, meaning, follow the (+) battery cable to plus battery post, then the jumper to follow the plus cable to the starter relay. Then the ground clamped to the negative battery post, and that jumper cable ground to the engine or frame. Better the engine, being the starter motor is the ground to the engine, loophole the frame for now.

Say it starts like the ST. Now swap the ground from engine to frame. Bike starts like the ST. That says the original complaint is a ground to frame problem.

This narrows it down to refreshing the OEM cables to show shinny bare metal, and scrape the frame's ground area clean to shinny metal as well.

Fires off like the ST or complaint? Fire right off. Then you don't need the piggyback cables, it was a ground to be freshened up.

Make sense?

Makes sense!! Really appreciate the detail on the steps. Looks like I have some testing and disassembly to get to. Again, my thanks for the reply.