OzVMX Forum

Marque Remarks => Yamaha => Topic started by: 80-85 husky on June 23, 2019, 09:33:23 am

Title: yz 490 k - ign
Post by: 80-85 husky on June 23, 2019, 09:33:23 am
hi all, can an IT 490 ign (stator and flywheel etc) be utilised on a yz 490 ?
Title: Re: yz 490 k - ign
Post by: OverTheHill on June 26, 2019, 08:51:17 am
Yes. My 490K came from the US to NZ with an IT stator with lighting coil. I suspected the original was still ok from things that transpired so got the original sent then oneday used it on my YZ465 motor [in an IT250K frame]. Just a warning--do the flywheel up good & tight & held solidly with a holding tool against the footrest etc for a positive feel. My 490k as i said, had an IT stator & the seller unbeknown to me had changed the stator prior to crating the bike up. Said he gave it quick rev & that was it. Quick rev have shorn off the crank key!!, then first kick here fkn near broke my leg with kick back. I knew straight away what was going on but was too late anyway as had taken tooth of the intermediate gear & bent a tooth on the kick gear. Was pretty pissed off [& limping] Buuttt fixed it & carried on for 10 years or so. Anyway, long story about bugger all but be careful please.
Title: Re: yz 490 k - ign
Post by: TT5 Matt on June 26, 2019, 06:32:36 pm
yeah no fun when a big bore 2t or thumper kicks backs and tries to break your foot,ive found lapping the rotor to the crank with fine valve grinding paste a good thing to do along with torque the nut to specs
Title: Re: yz 490 k - ign
Post by: 80-85 husky on June 28, 2019, 07:10:53 am
cheers, thats a good answer... i have always treated flywheels with huuuge respect after watching a mates older brother trying to start an xl 250 moto with 305 kit in the sand for an hr with a sheared key .....much unhappiness