Who's done front sprox mod !

MR C
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Who's done front sprox mod !

Post by MR C » Mon Jul 18, 2016 8:12 am

So yesterday I did 320 miles on the GT and one thing I deffo noticed is the tall 6th gear, it feels like a motorway only gear ! So I wondered how the 39 teeth sprox effects the gearing and ride.

MR C
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Who's done front sprox mod !

Post by MR C » Mon Jul 18, 2016 9:43 pm

Not sure how 39 got there !! anyway I brought a 16 teeth sprox from ktm today so I'll see how it goes [THUMBS UP SIGN]

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Re: Who's done front sprox mod !

Post by vet57air » Tue Jul 19, 2016 1:47 am

I installed 16 tooth sprocket last week on the GT. Had done it on my 1290r before. Way better for the riding I do. More torque and 6th is usable now.

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Re: Who's done front sprox mod !

Post by Tancakar » Tue Jul 19, 2016 1:36 pm

is 16 T makes the bikes better at low rpm?

MR C
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Re: Who's done front sprox mod !

Post by MR C » Tue Jul 19, 2016 2:35 pm

Apparently yes, it's a common mod on the SDR.

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Re: Who's done front sprox mod !

Post by Aussie Dave » Wed Mar 15, 2017 6:18 am

I'm interested but I wonder if the better way to go is a (say) 40T rear.

I used a 16T front sprog on my last bike because it was so tall in first gear you couldn't 'walk' the bike through slow speed roundabouts/roadworks and it didn't want 2nd cog until over 50kph in traffic.....but the KTO seems well geared until you go for 6th......then it drops 750rpms and the motor labours unless you have 120kph on the speedo.

I think a 16T front will be a bit too much (ie it is equal to 3 teeth bigger on the rear) and my feeling is about 1/2 a tooth would be about right.....hence a 39 or a 40T rear.......anybody done this? Can you note the revs at 100kph (or 60mph for a benchmark) in 5th and then in 6th......

Does the slightly bigger rear sprog cause any chain tension gauge problems (the marks on the slider on top of the swingarm).....I suspect it's only a slight change and shouldn't be a concern...... :?:
Current delights...1290GT-2017, CBR1100XX-2005

Prev loves...Capo1200TP-014, CBR11xx-002, 2xFZR1000genisis-94, FJ1200-89, FJ1100-84, XS1100P, VF1000F-83, CX500, VF750S, KZ1000J1-81, KZ1000ST-79, CB750F2-77, CB360T-74, CB175.. started it all in 1974 ;)

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Who's done front sprox mod !

Post by MR C » Wed Mar 15, 2017 7:51 am

I went from a 16 front to putting the stock 17 back on than I tried a 39 rear, the rear does make a very slight difference, you can use 6th gear at normal motorway speeds and it still retains the long(ish) gears that I like, I Also have a 40 that I will try next month when I unwrap the bike from its hibernation chamber.

Have done 4000 miles with the 39 rear, no issues with the chain guides and the adjustment lines are still fully useable.

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Re: Who's done front sprox mod !

Post by Aussie Dave » Thu Mar 16, 2017 11:46 am

Thanks Mr C.......it sounds like a 39T might be the go.....I treat the gearbox as a 5 speeder while running the motor in (it isn't happy with 6th so I don't use it for now). At 1450kms/906miles the motor feels stronger but 6th is still useless at our 110kph motorway speed limit...... I've still got to find a source of sprockets as my spares Angel doesn't have any listings for GT's .....had the same problem with the Italian Stalion.....no one in the bike industry knows anything anymore..... :lol:

Looking forward to your thoughts on the 40T......no pressure.......just get that snow melted and swap that sprocket...... ;)
Current delights...1290GT-2017, CBR1100XX-2005

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Re: Who's done front sprox mod !

Post by DaveNZ » Fri Mar 17, 2017 5:03 am

I Think 6th gear on the 1290S is designed for those Europeon motorways where theres no speed limits, i never use 6th either, unless doing a hundred miles an hour. but I'm in no rush to change the gearing, i never changed the gearing on my ex 1290R, I'm happy with the GTs gearing, theres enough torque to drive those gears as is.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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Re: Who's done front sprox mod !

Post by Aussie Dave » Fri Mar 17, 2017 7:58 am

Cheers NZ Dave...... I agree, the front sprog shouldn't be changed (unlike our experience with Capo12's...eh!) - I'm hoping a small reduction in overall gearing from a 39 or 40T rear won't change the 1-5 ratios by much, but might make 6th a little less of an autobahn super overdrive ratio....... 1290GT is mostly perfect (what am I saying.....it's fekin brilliant :D )......but a 750rpm super jump to an overdrive that can't be used without labouring the motor below 4.5/5k rpms seems an odd choice.....

The 1-5 ratios are so 'spot on', but being an Aussie, I like to use everything I've paid for :lol:

Maybe with a couple of 000kms more on the dial it will become a non issue - I might even get superstellar fuel economy on the sparsley populated (policed ;) ) back roads...... :idea:

Ps dropped in to KTM Central this afternoon and the boys in the service Dept showed me the recall fuel hose that they will install in the morning. It is an 'S' shaped hose that fits in the palm of your hand and has a connector on one end (I suspect that end might be the problem on some VIN's). 8-)
Current delights...1290GT-2017, CBR1100XX-2005

Prev loves...Capo1200TP-014, CBR11xx-002, 2xFZR1000genisis-94, FJ1200-89, FJ1100-84, XS1100P, VF1000F-83, CX500, VF750S, KZ1000J1-81, KZ1000ST-79, CB750F2-77, CB360T-74, CB175.. started it all in 1974 ;)

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Re: Who's done front sprox mod !

Post by MR C » Fri Mar 17, 2017 10:13 pm

Aussie Dave wrote: Ps dropped in to KTM Central this afternoon and the boys in the service Dept showed me the recall fuel hose that they will install in the morning. It is an 'S' shaped hose that fits in the palm of your hand and has a connector on one end (I suspect that end might be the problem on some VIN's). 8-)
Yeah the plastic push in connector has known to pop out and spill fuel.

Back to the gearing, changing the gearing I've noticed in a lower gear such as 2nd it's far more useable on switchbacks whereas before with the stock gearing whilst it was fine it felt like 2nd was still too high gear to be in.

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Re: Who's done front sprox mod !

Post by DaveNZ » Sat Mar 18, 2017 2:57 am

Interesting your take on the gearing MrC, probably feel the same as you, if i ever was to alter the gearing id go the same way as AussieDave and fit a 39 or 40 rear cog, i don't like fitting smaller front cogs, hey today i went on a hell fast ride with a couple 1299Ss, and a few times i went into 6th gear, and its now very smooth in the high gear, even around 120Ks, the rottweiler o2 removal sensors have ironed out the below 5500 Revs, and as a buy product its made 6th gear viable around 120K and smooth, so I'm a happy camper. Since i had my big off on the GT i really haven't pushed it hard, lost a little confidence, and confidence in the tires, but today i pushed the bike really hard, and it felt great in sport modes, my fromt tire is nearly shagged, it may make 5000Ks, still plenty on the rear, looking like around 6500-7000Ks hopefully. So new front soon, and its going to be a M7RR, for more confidence to push harder.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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Re: Who's done front sprox mod !

Post by Bruce Wayne » Sat Mar 18, 2017 5:35 am

I was thinking about changing the gearing at first (I also had a 16T front sprocket on the Capo) but I've decided to leave it as is for now.

If you're interested in the effects changes would make, this is a pretty cool tool:
http://www.gearingcommander.com/

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Re: Who's done front sprox mod !

Post by Aussie Dave » Sat Mar 18, 2017 10:01 pm

Good plan Batman.......capo was an obviously 'too tall geared' critter, KTo is much closer to just right so the 1 tooth front would be way to much of a reduction........just a case of getting a feel for matching a very slight change (ie the equiv of 1/3 or 2/3 of a tooth on the front) on the rear to suit local corner radius's ( :roll: radii?) or rider preferences...........I wouldn't be thinking about gearing if the GT had a smaller jump to 6th.....the ratios are just about perfect (though, now it's been mentioned - 2nd does feel a poofteenth high occasionally)....... I haven't done enough kms yet to really know my own mind on the issue......the Oxley Hwy in May will sort me out on tight corner ratios...... :twisted: :lol: :lol: Hell, even a change in tyre brand will affect the gearing slightly (hopefully not the nice accurate speedo!).

Hey, that's rain!......the weather gods evil plan to entice me out to play in the road spray didn't work :lol:

Quiet Sunday......damit, good for fitting fender extender and top rack.....had they arrived early....bugger!
Current delights...1290GT-2017, CBR1100XX-2005

Prev loves...Capo1200TP-014, CBR11xx-002, 2xFZR1000genisis-94, FJ1200-89, FJ1100-84, XS1100P, VF1000F-83, CX500, VF750S, KZ1000J1-81, KZ1000ST-79, CB750F2-77, CB360T-74, CB175.. started it all in 1974 ;)

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Re: Who's done front sprox mod !

Post by DaveNZ » Sun Mar 19, 2017 12:00 am

Beautiful cloudless 24 degree weekend here Dave, i love these still warm Autumn days, perfect for riding, on my multistrada, i kept the 17 tooth front sprocket and upped the rear by 2 teeth, the bonus was a 15mm shorter wheel base. it made the multi much nicer in the tighter stuff, and around town, but the GT has great town manners.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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Re: Who's done front sprox mod !

Post by AllanP » Sun Mar 19, 2017 7:22 pm

DaveNZ wrote:Beautiful cloudless 24 degree weekend here Dave, i love these still warm Autumn days, perfect for riding, on my multistrada, i kept the 17 tooth front sprocket and upped the rear by 2 teeth, the bonus was a 15mm shorter wheel base. it made the multi much nicer in the tighter stuff, and around town, but the GT has great town manners.
That may be something I do on my bike one of these days, 6th gear is barely usable even at 80mph. You're certainly right about the bikes around-town manners. I imagine its running pretty lean to meet modern emissions requirements but in spite of that pulls very cleanly from any rpm and is very easy to ride. One measure of that for me is how easy it is to do tight feet-up U-turns. For all its power, the fueling/engine management is beautifully sorted out and a complete novice could ride one ..... if you limited the twist grip range :lol:

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Re: Who's done front sprox mod !

Post by Emmjaydee » Sun Mar 19, 2017 10:24 pm

MR C wrote:I went from a 16 front to putting the stock 17 back on than I tried a 39 rear, the rear does make a very slight difference, you can use 6th gear at normal motorway speeds and it still retains the long(ish) gears that I like, I Also have a 40 that I will try next month when I unwrap the bike from its hibernation chamber.

Have done 4000 miles with the 39 rear, no issues with the chain guides and the adjustment lines are still fully useable.
Looks like an easy enough change over for the rear sprocket. Assume it is just slacken off the rear hub adjuster, and then the bolts on the sprocket, slide off and replace, and reverse?

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Re: Who's done front sprox mod !

Post by DaveNZ » Mon Mar 20, 2017 3:48 am

Emmjaydee wrote:
MR C wrote:I went from a 16 front to putting the stock 17 back on than I tried a 39 rear, the rear does make a very slight difference, you can use 6th gear at normal motorway speeds and it still retains the long(ish) gears that I like, I Also have a 40 that I will try next month when I unwrap the bike from its hibernation chamber.

Have done 4000 miles with the 39 rear, no issues with the chain guides and the adjustment lines are still fully useable.
Looks like an easy enough change over for the rear sprocket. Assume it is just slacken off the rear hub adjuster, and then the bolts on the sprocket, slide off and replace, and reverse?
Loosen the the sprocket bolt first before loosening the rear hub, changing the rear sprocket will be easier, as the GT has a quick release sprocket carrier, just 6 bolts holding it on, thats the way id go, small front sprockets tend to wear out quicker, and wear your chain quicker also, tighter radius.
Last edited by DaveNZ on Mon Mar 20, 2017 6:58 am, edited 1 time in total.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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Re: Who's done front sprox mod !

Post by Emmjaydee » Mon Mar 20, 2017 6:13 am

Cheers Dave. Am at my dealer on Wednesday for the fuel line recall thingy so may pick up a rear while I am there

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Re: Who's done front sprox mod !

Post by DaveNZ » Mon Mar 20, 2017 7:04 am

Emmjaydee wrote:Cheers Dave. Am at my dealer on Wednesday for the fuel line recall thingy so may pick up a rear while I am there
The good thing about having the sprocket carrier, is it makes rear sprocket removal easy, and if your not happy with the lower gearing, you can refit the origonal sprocket easy, doing the front sprocket takes much more effort. Most front sprockets are toast (hooked) by 20,000Ks, so thats the time you want to do the front change, and only because you have to. A 16 tooth sprocket isn't too bad on chains, but 15 tooth are a very small radius, i think the GT comes with 17 up front and 38 rear, i may at a later date when i do both sprockets and chain, opt for a 40 rear sprocket.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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