Grand Prix 125
Main Motorcycle: 96 !200 Trident
Join Date: Jul 2019
Location: Leaving Apple Valley, CA going to Pinetop, AZ
Other Motorcycle: 98 Sprint
Hi Nigel, Only a tad nervous about the work? Do you know how much work it is just to replace this spring you're talking about. I didn't do the spring replacement route. I replaced the whole sprag clutch for a used one I bought on eBay. It is a big job and I've done it a few times on a 900 and once on a 1200. Take the engine out of the frame, flip the engine over and take off the bottom half, good luck finding the two hidden bolts holding it together. A good schematic helps in finding the two bolts and on which gaskets and o-rings need to be replaced. You will be lifting out the transmission shafts. Good news is you can leave the head on, just take off the cam cover. So start the job with engine at top dead center with the cam arrows pointing at each other and the transmission in neutral. You do have a Haynes manual don't you? Here's the bad news. Triumph used two different sizes of sprag clutches with a little corresponding gear. 51/15 or is it 13? The other is 53/13 or is it 11. Somebody help me out here, it's been a couple of years since I did a sprag clutch. Anyway, you VIN number isn't going to give any clue to what sprag you have. If this helps any, Triumph started using the bigger sprags on the 955 engines. So if you decide to replace the whole sprag with another get the little gear also. There are a lots of 955 engine parts listed on Ebay. Usually a sprag will last a long time if you keep a good battery with a full charge. Bad batteries are sprag killers.