Hot Starting Or Not Tiger Sport

Well, touch wood, (taps head ) my 2018 has yet to play up.

My own researches say that the problem supposedly lies in the design of the standard Denso starter with Speed Triples also affected. Apparently there is no direct earth contact through the -ve brush plate. Most starter motors have their -ve terminal bolted into the starter body or have the brush soldered to earth. On the Denso the brush plate contact is a press fit created when the starter was originally assembled.

Time and corrosion weaken the electrical contact. The definitive fix (if you don’t fancy periodic disassembly to polish the thing!) is to solder a heavy gauge wire directly to the earth brush via the brush plate and drill an adjacent hole in through the aluminium motor body to route the wire to a ‘meaty’ eyelet on a suitable earthing point.......

I am about 2 years behind you so let me know how it works out! Remember, supposedly/apparently!!

 

As far as I am aware the problem is associated with older models rather than the 2016 facelift+ bike. Starting issues can have multiple causes and online it all gets ‘give a dog a bad name’.
I should have asked if you were on the original battery or you had it load tested to see what amps it still throws out? If it is not new it may well be time expired. Equally, bikes left outside have far more opportunity for rain to attack handlebar switches etc., and you never have the test equipment in your back pocket when trouble strikes to see if the starter is receiving battery voltage, check terminals etc.

 

Have a read of the thread in this section on the subject from 3 days ago.

It is a known problem with the starter motor. Triumph have since beefed it up at substantial cost.

 

It was an occasional feature of my last Tiger 955i too. ....though not my current 955i.for some reason.
Although it's annoying, it's really not a big deal .....unless you're in the Gobi desert being chased by bandits of course, in which case I'd be pretty pissed off about it.
I've known other bikes with far scarier flaws.

 

I have exactly t'same problem wi mine. I stalled it last week at a busy traffic light junction, when I thought mi bike was in neutral, whilst perusing an attractive lady int car next to me. Took 35 mins for mi bike to cool down enough to start, it normally takes about 15 mins.. When I put a post on here t'same as yours, everyone seemed to advise changing t'battery. I tested mi battery, and it seems fine. I did a little experiment t'day after. I charged mi battery overneet, then rode to work next day, a 10 mile journey. I stopped mi bike, then turned it off. Turned it back on, pressed t'button, and it fired straight up!! Maybe it is t'battery.

 

And naturally it will occur at the worst possible moment.
Do you have a voltmeter? It would be worth checking how your battery is performing at rest/ overnight/ when hot and under load before buying a new battery.
Having said that, 9 out of 10 starting problems turn out to be battery issues.
Fir what it's worth I had a failing starter motor on my last 955i rebuilt in 7 days by my local auto electric shop....cost £70 as opposed to the £500 Triumph wanted for a new one.
Though if it's the earth that's at fault obviously that wouldn't make the difference in itself.

 

Someone put a post on here about how he'd cured it. I think it was one of our colonial cousins from across t'pond. He'd run an extra earth cable from t'inside ot starter motor to t'frame. I can't find it though. He reckoned it were summat to do wit heat int starter motor.

 

As above. It was about the lack of a dedicated earth strap on the -ve brush terminal and build up of corrosion between the press fit and motor body.

 

Thats the one, mate.