It's more similar to a motorcycle engine - whether it's a 325 or 425 is not an issue - they used the same configuration in the transmission. See depictions - more text below
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The problem is more likely in the shifter than the transmission, but could ultimately be in the transmission - the problem is if it is anything other than a binding shift shaft or a problem with the manual clutch release, it will require complete engine disassembly to repair, but whatever it is, it will require partial engine disassembly (removal of the clutch cover) - the first thing to do is inspect the external part of shift shaft to see if it might be something to do with movement of the shift lever - get the rear wheels off the ground, leave the engine off and while turning the rear wheels gently, move the shift lever by hand - when pushed down it should 'click' into gear and when you let off the lever it should spring back to the center - mark the case where the foot end of the lever stops (neutral position) - when pulled up (still turning the wheels) it should shift into the next gear and when released return to the same neutral position it stopped at when shifted down - if it does not return to the same position, it could be a binding or spring problem - if it sticks at the up position it's a binding problem, if it falls to the down position from the up position, it's a broken return spring.
I hope this helps
The problem is more likely in the shifter than the transmission, but could ultimately be in the transmission - the problem is if it is anything other than a binding shift shaft or a problem with the manual clutch release, it will require complete engine disassembly to repair, but whatever it is, it will require partial engine disassembly (removal of the clutch cover) - the first thing to do is inspect the external part of shift shaft to see if it might be something to do with movement of the shift lever - get the rear wheels off the ground, leave the engine off and while turning the rear wheels gently, move the shift lever by hand - when pushed down it should 'click' into gear and when you let off the lever it should spring back to the center - mark the case where the foot end of the lever stops (neutral position) - when pulled up (still turning the wheels) it should shift into the next gear and when released return to the same neutral position it stopped at when shifted down - if it does not return to the same position, it could be a binding or spring problem - if it sticks at the up position it's a binding problem, if it falls to the down position from the up position, it's a broken return spring.
I hope this helps
