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Post by StewRoss on May 5, 2008 4:34:02 GMT -5
Something of interest to SR owners who have countershaft seal problems...such as Rick on Saturday at the race track...it popped out and he lost a lot of oil onto the track and his back wheel...resulting in a get-off...  The later model bikes have a seal retainer plate that screws over the top of the seal...see below...we must be able to sort something similar out ourselves if needed. This pic clearly shows the retainer, the later model oil line and the CV carby that they come with...if you've ever wondered.  ...item #3....  SR  |
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Post by aero on May 5, 2008 4:46:14 GMT -5
Having had a suzuki gsx250 blow out its clutch push rod seal, resulting in a rear tyre covered in oil I'd say a mod like this is pretty important.
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Post by StewRoss on May 5, 2008 4:58:01 GMT -5
To be fair it doesn't happen often, but the results of it moving aren't good. I'll have a look, but I reckon you could make a plate to use the existing sprocket cover retaining screw mounts...or at least two of them...the 400 has 2 dedicated bosses formed into the new cases. Maybe it could incorporate a case saver as well. I'll check out the screw alignment. Simple fit on a race bike with no sprocket cover...a road bike would need modification of the sprocket cover standoffs I guess...  SR |
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Post by caferacercarl on May 8, 2008 3:16:08 GMT -5
All was fine at eastern creek, then the bike sat untill race day some 2 months later and the oil slowly drained into the sumpand on race day it was topped up........... when I asked rick to measure what drained out, he said over 3.5 litres...................an old trap for 500 owners, RUN engine for 3 mins before checking oil level [as per factory manual] it was pumping out the breather before the front sprocket seal popped out, check the thread on oil coolers and weight of oil as well versus temperatures...... its OK guy's just be carefull.
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Post by StewRoss on May 8, 2008 3:22:20 GMT -5
Good point Carl... SR |
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Post by caferacercarl on May 8, 2008 3:35:08 GMT -5
But I still insert the seal with grey three bond 1104 on both seal and engine side after wiping clean with metho or the like, it is an area to be wary of and I can see why Yamaha fitted the retainer, the seal only has some 5 or 6mm seating face, as everyone can see," I have no life"
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Post by colinjay on May 8, 2008 18:48:46 GMT -5
The countershaft sprocket seal comming out was a common problem on the XT/TT500C models. From memory, Yamaha put out a service bullitin that recommended putting 3 small self-tapping screw at 120 degree intervals around the ouside edge of the seal. My TT500C had this done to it back in the 70's and it seams too work oOK.
CJ
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Post by StewRoss on May 9, 2008 1:53:09 GMT -5
Hmmm, that fix sounds a bit barbaric to me...designed by people that expect you to buy a new bike each year... SR |
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Post by caferacercarl on May 10, 2008 5:40:41 GMT -5
I wonder colin if in the early days, when people put stuff like "BP corse plus 50" in them that it was a more prevalent problem.. don't worry, it made me have a big think when I came across the problem, and later on my own bike [at 140 in minus 7c with 30w70 in the motor and a oil cooler] and I just kept it upright.......
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sven
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Post by sven on May 10, 2008 9:29:29 GMT -5
Hmmm, that fix sounds a bit barbaric to me... Yes, that's a bit russian... I got a pair of cases apart and on the milling machine next week, so I'll try to use the threads of the 3 screws #13 for this... |
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Post by caferacercarl on May 13, 2008 2:54:15 GMT -5
I think its not a bad idea especially as you have a mill and the skill, eventually I found a way to stop it ,but, a retainer plate is good insurance. keep us posted, the new yammy threads go right through the cases, but not where you are looking. cheers carl
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sven
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Post by sven on May 13, 2008 11:04:16 GMT -5
...but, a retainer plate is good insurance. Sure! I must admit, I have not yet used one, though a friend of mine lost the seal on his SR500 racer and produced an oily trace all around the complete 2.5 miles racetrack... Regards Sven |
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Post by caferacercarl on May 17, 2008 4:20:05 GMT -5
But as mentioned, a clean engine and seal glued in with three bond grey, and 10w40 warmed up to 60c doesn't seem to be any problem, even up to 10,000rpm, but be wary of weight of oil and oil coolers and glue the seal in. it works. but I had to learn the hard way too.
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sven
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Post by sven on May 17, 2008 12:29:46 GMT -5
... a clean engine ... 10w40 warmed up to 60c ... Apropos: let's not forget you'll recieve nice results with warm 10W40 - all the ugly chain grease will be washed away to leave a wonderful clean engine....  |
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Post by caferacercarl on May 23, 2008 4:19:55 GMT -5
I can see that a mate of mine was right about the net, he said he'd give me 6 months and I would give up, its coming close....
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