My suggestion is try the battery first and see what that does for you.
It's way easier to change a battery than a starter.
Not to mention adding the cost of a possibly unnecessary starter and fluids and gaskets.

I'd install the battery and grab a volt meter and see what it tells me before I bought a starter.

 

put in a 1.4kw allballz when I did the 124

blew the starter drive within 6mon, allballz replaced under warranty (go them!)

not wanting to miss the already short riding season, i threw the stock 1.2 starter in

been 2.5 years now....the stock 1.2 spins over my 11:1CR 124" with little to no struggle as long as the battery aint dead. hot-starts are another story (dead stall if i catch it wrong). I'll keep an eye on this thread - got a "batteries+" battery 3 years ago....havent killed it yet....but it dies FAST if i aint riding every day...and im not great about keeping it on a tender. Been lookin hard at the lithium versions

 

my main bitch has been cold weather starts, the tp121 is a lil bitchy to fire under 50 degrees outside, usually have to adjust the idle mixture, and the battery just wont hold up even using comp releases, it maybe just a battery thing, what is the best high cca battery i could get? btw i keep my battery on a tender all the time, thinking the cheapo battery just doesnt have the bal*s for the cold start, it starts fine the rest of the day, just not on cold mornings

 

Are you getting starter kickbacks and grinds

 

an occasional kickback but not not regularly

 

Timing might be to hot advanced

 

I am running a 720 cranking amp lithium ion battery made by antigravity along with Sumax cables.

$$$$$ but I love it.

 

USA-Made Big Crank ETX30L 400 Battery $109.00, All ***** 1.4 starter, big cables. Starts the monster but broke the starter drive 2 years ago so not invincible, battery finished it's third season and still strong

 

Thats a big battery and definitely won't fit in my fatboy....

 

What about compression releases? Wouldn't that be a better solution?