rosszx9r Posted June 12, 2010 Posted June 12, 2010 Hi Guys, long time no speak bike has been off the raod since last summer when i blew the head gasket!finally got round to rebuilding the engine...(ZX9r B1 44k miles)making progress with the engine rebuild.... top end complete with no issues but i'm baffled with the gearbox fault... the reason i was stripping the bottom end was because the bike was not always engaging 2nd or 3rd gear from time to time unless i really forced it through. it would also occationally jump out of gear when under load. i was expecting to see worn forks or dogs but they all seem fine... http://www.postimage.org/image.php?v=PqEiuNrthe fork ends measure 6mm which acording to the haynes, it spot on. the fork ends do look shiny and at first i thought they had been rubbing but this is just coloration. i can't feel any signs of actual wear (there would be a step from light to dark areas) any suggestions on what else it could be? (selector drum is fine too)all help appreciated. Quote
rosszx9r Posted June 13, 2010 Author Posted June 13, 2010 well i guess if i've got a moped or a scooter then this is the place to be otherwise, i need to find a motorbike forum....... Quote
Stu Posted June 13, 2010 Posted June 13, 2010 well i guess if i've got a moped or a scooter then this is the place to be otherwise, i need to find a motorbike forum....... give people chance to see the thread ive only just noticed it as you bumped it with this comment!!! Quote
Guest Posted June 14, 2010 Posted June 14, 2010 grit in the selector seal?? SV's suffer from it, so might be your issue, just seen this, and never rebuilt a gearbox, so i am guessing... Quote
Guest Posted June 14, 2010 Posted June 14, 2010 a quick google came up with this.. In order for a gear to be selected , the selector shaft needs automatically to return to a common central position in the gearbox in order for it to move across and select the next gear (whether an upshift or downshift). This happens automatically within a split second when the shift pedal is released (ie you begin your gear change) through the selector shaft being spring loaded. Now, this is where the problem comes in ..... if youre an all weather, all year round rider and the bike is left open to the elements, the innner shaft between the pedal and rearset bracket corrodes and causes the pedal to stick and not return back to the correct position for re-selection. The quick fix is to remove and strip the rear set, polish the shaft with a wire brush .......... tried rephrasing that but could't come up with anything better , and then lubing it with a little silicone or graphite spray. Makes the world of difference. high-speed.ismysite.co.uk/phpBB3/viewtopic.php?f=25&t=7260&start=0 Quote
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