im in the same school off thought burn outs thrashing the thing removed the outa butterflys add a Viking (cheers Paul) ram air always Motul oil ect and mine lost 4th only and so inspected Detent spring all good but replaced rode it but called it a 4 speed , only to be told by our man John in Katikati nz that it will be a bent selctor arm so I done another 10000 odd ks and rode into his shop one day and a week later he had repaired the issue for less than $1k nzd so normal riding has resumed and ive got my 5 speed back ive had friends do the same repair in the dealers and have come home with a fixd gearbox and mmmmm a sore bum ? and 4k less in there pocket hardend gears and afta market shiming kits ???? fck just do it once triump and do it properly forchucksteak anyway that's my 10 cents worth