<BLOG> Not brass monkeys weather, so the rear wheel of the YZ250 came out today to be shod with something more suitable for tarmac. I knew the rear suspension was past its best from the ominous squeaking and slight clunking from the nether regions under provocation. Not much of an issue when bimbling along forest trails, but I don't think the NHCA scrutineer will be terribly impressed by the play in the linkage and possibly swinging arm bearings. The Clymer manual makes it sound so easy - "use a long extension and socket to loosen the relay arm pivot bolt nut". Hernia prevention 101 and self preservation soon put a stop to that. Plusgas has been applied and it looks as if I may get to play with my rattle gun again. </BLOG> -- +-------------------------------------------------------------------+ | Pete Fisher at Home: | | Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" | | Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" | +-------------------------------------------------------------------+
Same here, gotta get the crank nut off a landie 90 -- Nige, Land Rover 90 Yamaha R1 Range Rover Vogue
Left it to soak in Plusgas while I had a quick cobweb blow out in the MX5 and it finally shifted with my biggest breaker bar. I have never seen such utterly shagged bearings - ever. I can't remember finding needle rollers actually broken before. It's all shot. The shims on the swinging arm thrust bearings are rusted and cracked. I don't think the frog who had it before me knew what grease was. From a quick Google I can get a complete bearing and seals kit for it. but I think I'll let John at Revs put them in. I'm hoping he can also helicoil the chain adjuster thread that's fucked - or tap them both out to a bigger size. Otherwise I think I'll just knock the project on the head and do a break and Ebay job. -- +-----------------------------------------------------------------+ | Pete Fisher at Home: | | Visit my Home Page : http://www.flarefox.com/Lesbordes | | "Do not adjust your mind - there is a fault in the reality" | +-----------------------------------------------------------------+
When I took the Gamma apart after seizing it in its first race at Westwood[1], then having it restart only to terminally die as I crossed the finish line, I didn't find _any_ rollers in the small-end bearing -- just dust... [1] Having forgotten that a Suzuki two-stroke needs the clutch to be engaged to activate the oil-pump. -- Ivan Reid, School of Engineering & Design, _____________ CMS Collaboration, Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005 WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon) KotPT -- "for stupidity above and beyond the call of duty".
Should have bought a Yamaha with Autolube. A year or so ago stripped down my nephew's old Aprilia RS50 and found the cause of the bad rattle it had before it seized - there were only two complete needles left in the small end bearing. As he was skint and flogging the thing we did a cheap job of repairing it, which involved delving around in the crankcases with a magnet on a stick to fish the broken bits out of needle and cage, matching them all up to what was missing then putting a pattern barrel and piston on with a new small end bearing. It's still running ok cos one of the local scrotes has bought it and I see it nearly every day being ragged up the High Street. One of the things he was told was that he absolutely must run it on the best fully synth 2-stroke oil available, which is something my nephew had been told but ignored, hence the seizure and destroyed bearing.
Better off with the right petroil mix. I've had catastrophically failed needle rollers inside a two stroke before - like the SWM at Cadwell on hill climb gearing. Not seen the like of these outside an engine though. So many of the buggers to replace as well, not like good old phosphor bronze bushed swinging arm bearings and twin shocks. -- +-------------------------------------------------------------------+ | Pete Fisher at Home: | | Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" | | Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" | +-------------------------------------------------------------------+
Replacing needle roller swinging arm bearings can be quite easy. I did the job on my semi-rat LS650, which had bearings like the ones that you found - rusted solid and completely fucked. I got the old bearings out by hammering an old, thin screwdriver between bearing casing and seating. The bearing casing is quite thin and distorts fairly easily, making it possible to deform the casing enough to loosen it and remove it. The damage done by the screwdriver to the seating for the bearing was minimal and as it only affected a very small area of the whole seating it wasn't going to be a problem. I then throughly cleaned the seating and smoothed down the scratch left by the screwdriver. then greased it lightly to assist the new bearing going in. Next step was to use a long threaded bar with suitable combinations of large washers and sockets to pull the new bearing into place by tightening down a nut on the threaded bar. The whole job took less than an hour to do both sides.
I'm pretty boggled to see a post like this from you with no random swearing, you big cuntlyfile-watching pissflapping gash-faced minge shitter.
In communiqué <hkj74o$1au$-september.org>, TMack Well I think I'll at least have a go at getting the remains of the old bearings out. Chatting to one or two others at the NHCA AGM today confirmed that your technique usually works OK. The latest problem is the rear tyre. I had an Avon AM23 club race 130/650 x 18 that I decided was too big for the Morini, and Avon said would go on a 2.15 rim OK. The fitters can't get it to seat perfectly by one of the security bolts (which aren't really needed now anyway). It's currently got loads of gloop on the affected area and is sitting pumped up to UXB pressures in a warm place. It was creeping slowly out, but isn't anymore. Should have been less of a pikey and had the wheel rebuilt to wider and 17 inch while I was having the front done. -- +-------------------------------------------------------------------+ | Pete Fisher at Home: | | Voxan Roadster Yamaha WR250Z/Supermoto "Old Gimmer's Hillclimber" | | Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" | +-------------------------------------------------------------------+
