This thread will document discoveries about and improvements to a 2005 Montesa-HRC 250 4RT by yours truly, motobene (by the way, that is from Italian and is pronounced moto-baynay and means "moto-good), and KrAzyOSUCowboy (I get confused as to what is in caps and what is not). My hope is KrAzy will weigh in A LOT (it's your bike). I don't want this to be a one-man show :huh as the results on-the-ground are better reported on by the rider and owner. This first posting sets up the background in a stand-alone thread which we'll fill in later with detail as we get time. 4RT riders please contribute your opinions, experiments, and foibles. My hope is you will try some of these things and report back. This particular 4RT was bought within this year in pampered shape with few hours. It was and remains in exceptionally good condition. The rider came off a 2006 Beta Evo 250. Reason for seeking out a 4RT was the preference for 4 stroke power characteristics. KrAzy had a positive experience test riding a Beta 300 4 stroke, but the 4RT was available and was less than half the price given the 7 model years difference. The positives of this design are many, like the super compact 4-stroke top end, excellent build quality and reliability, very good power. I have found test riding it that is one of the best bikes regarding on-the-rear-wheel handling. The 2005 was the first model year of the 4RT. Some details weren't as worked out as could be on the more recent model years. We don't know what a more modern 4RT feels like because there isn't one here or anywhere near here. We can't report on the overall differences between a 2005 and a 2013, or even a 2007, unfortunately. KrAzy has toured the parts lists extensively and found very little difference across model years and some interesting facts about what parts are shared with the Honda product lineup. Suspension, valving specs, rake and trail, FI mapping and other minor details (which sum to significance) are outside the parts lists, however, and we are blind in that regard. What we can report accurately on is the 2005 model and making it significantly better. I hope you all will find that interesting and helpful as this thread fleshes out. Targeted Improvement Areas: - Handling. Reducing over steer (hyper-active steering in small-radius turns). - Clutch. Disengages and re-engages too fast, faster than the rider's brain can keep track of especially when tired. This causes rider brain 'control system ring'. Pull in clutch = fast release. Brain says, "Woa now, I gotta go!" Letting out the lever result in quick engagement and a too-strong impulse forward, causing the next over compensation. Pulse-pulse or pulse-pulse-pulse results! The clutch increases brain 'calculation burden' resulting in distraction, inaccuracies and points taken. The negative effects are more pronounced with less experienced riders. - Suspension. Excellent hardware but out-of-date 'software' (valving specs). Too slow in 2005. Way way too slow in 2013! The rebound adjusters were quickly set at full minimum and they stayed there until recent major improvements (more on that later). Set up stock the bike feels very heavy (worse in colder weather) requiring forceful rider inputs. The slow response also hinders learning techniques. - Power. We have had no issues with power. This bike came de-restricted and it runs very well. Improvements don't imply the 4RT isn't unique or great. They don't imply you can't kill the competition on your 4RT. This is all about the joy of improving and the pleasure that comes from 'mo-bettah.'