Around a month or.so ago I fitted a D.I.D xtrme upgrade chain and sprocket kit to my new to me Z the oem stuff had done 10500 ish miles and the chain had decided to jump the rear sprocket bending a few links so it was in a word ******ed.

Fitting the kit went very smoothly and all was dandy allthough I did notice tht the final drive was a little noisey for brand new gear. And I had a jolt in the transition between excelleration n deceleration and and vise versa, I had done the cushdrive mod so ruled that imediatly, So I played with the chain tension and got the verniers out to make sure the wheel was perfectly aligned but to no avail, the noise persisted as did the jarring.

Roll on a month and problem is still here, after extensive investigation I realised that the front sprocket meshed very poorly with the chain, as in I could rotate the sprocket around 2mm either either direction before it actually meshed fully with the chain. It was not loose in the spline.

Needless to say I took it back to lbs and told them the issue and they rufunded me, so I ordered a renthal sprocket from eBay 50p cheaper tham JT and swapped them over, noise now gone and the meshing is perfect.

Has anyone else had any JT front sprocket problems?? A one off maybe?? The rear is excellent and fits and meshes perfectly.

Renthal fronts for me from now on I think.

Jon

must have been a dud. ive always rated JT sprockets. used them on loads of bikes

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Must have been a one off lbs has sold many kits with JT sprockets and had no complaints, theyve even ordered another in so we can measure and compare them. Used JT sprockets on my Husqvarna for years and theyve been fine, I just wandered if it was a problem with this specific model??

Sounds like a duff sprocket or an error in sizing. I have used JT on many bikes and never had a problem.

The only difference is that OEM sprockets often have rubber inserts for damping noise and vibration, which aftermarket sprox tend not to have, so they often run a bit noisier. But if the chain isn't meshing perfectly with the sprocket, then something is badly wrong.

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Check the front and rear sprocket line up.The chain poss running out of line.

I've only ever used JT sprockets, never had a problem

+1

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946