2012 rmz250 detent spring update
Posted 16 January 2012 - 07:28 AM
Posted 20 January 2012 - 04:50 PM
Posted 21 January 2012 - 03:53 PM
if you do start to have problems it will probobly be too late. im just curiouse though, i dont care to find neutral when im riding, and when i do need to get it into neutral to push into the back of the van, then i simply shut it down and then find neutral that way. i honestly cant think of a situation riding that id need to shift into neutral for...
Posted 24 January 2012 - 12:47 PM
I can!! I pitched up at a race last year for a pre season shakedown at a different club to mine, I was running 4th in the B's and utterly loving how fit and flowy I was feeling! It was a mixed terrain track and I dropped it over a single into a sandpit. Quickly picked up and tried to get going again, bike in gear, hot start down -kicked the life out of it, couldn't get it to start. Eventually after resorting to finding neutral with my hand I started it and finished the race. I took so long getting it running I finished in 23rd!! Priced up a rekluse as soon as I got home! The RMZ is a pain in the ass to find neutral in when you crash! Luckily most of the time it'll start in gear if its hot.
Posted 25 January 2012 - 03:16 AM
Posted 10 April 2012 - 12:49 PM
Posted 11 April 2012 - 11:37 AM
Hey Dube350.. please post feedback after you ride your bike with 450 spring.
Posted 18 April 2012 - 01:40 PM
Posted 18 April 2012 - 11:23 PM
Posted 19 April 2012 - 09:00 AM
If Suzuki had a recall on the 2010 why is it that my 2012 still had the 250 spring in it when I bought it? Wouldn't Suzuki have the 450 spring in the 2012 if there were a recall on the springs in 2010?
Posted 19 April 2012 - 12:48 PM
Posted 19 April 2012 - 02:05 PM
Maybe cause it is a 250? Just because they have different part number between the 450 and 250, does not mean that the 2011 - 2012 did not get a updated stiffer spring.
Posted 20 April 2012 - 04:32 AM
Posted 20 April 2012 - 08:15 AM
Posted 20 April 2012 - 10:02 AM
Posted 20 April 2012 - 01:35 PM
heres the deal with this situation: if you have had the shifting mechanism and transmission apart on these bikes then you should understand the following. suzuki's basic transmission design has changed very little in the last decade, it has undergone only minor refinements which are positive in one respect, but cause undesirable side effects over the long term. one of the major changes throughout the years is a more mellow (shallow)| shift star detent valley (the part that the follower cam is supposed to "lock" the drum into each position). the obvious advantage of doing this is smoother, less resistant shifting. the disadvantage is that the follower cam cannot detent (keep still) the shift drum from rotating as the bike gets jarred around. for those who know how a transmission works, the shift drum has grooves machined into it which actuate forks that move the gears side to side and into engagement. if you have a weak detent, the shift drum will be allowed to move more easily as the bike gets jarred around, thus the forks will also move, resulting in the gear doggs coming out of full engagement. this "partial" engagement is what is causing rounded gear doggs and premature failure. the stiffer detent spring fixes this issue by applying more pressure to the drum cam follower, keeping it more secure within its detent. but the true fix would be to machine the shift star valleys to be deeper with a more aggressive profile, much like the original shift star found on the RM250 2 stroke. this is why it is recommended by the community here to at least change the detent spring for a stiffer one. this only applies to those who have had failures related to the gear doggs wearing prematurely... I speculate that suzuki has taken fire in the past for having gearboxes which where "stuborn" shifting. their response was the above modification, however the consequences were overlooked, and ove the last few years they have been doing all sorts of refinements with the gears themselves (in 2011 they beefed up 3rd and 4th gears) hopeing to solve the problem without sacrificing shifting performance. I believe that the actual shifting mechanism is need of revision to keep those gears engaged...
Posted 20 April 2012 - 02:02 PM
Posted 20 April 2012 - 10:20 PM
i havent run the numbers on other brands, but those who are having gear drop out (premature gear dogg wear) would have benefited with the detent spring upgrade... (of course it would be too late to perform the mod if the issue has already occurred)