Post by dps650rider on Feb 16, 2009 22:05:43 GMT -5
Well, I guess I should consider the first set a practice run. Once I got the engine apart I could see that the rockers in it were in better shape than the spare set. They also were worn into the cam so I decided to use these instead. After rotating the cam over a lobe and watching the geometry I decided that I didn't need to grind the angle at the end of the rocker to help oil the elephant feed so the strength of the rockers is not compromized.
Here's some pics...
The cone ground into the rocker...
With the adjuster installed and fully retracted. This cam has a stock base circle and assembly can be done without compressing valve springs...
The adjustment set to the proper clearance and the valve closed. When the valve is fully opened there is plenty of room for oil to get in and clearance between the foot and the cone cut into the rocker...
The cone cuts and shorting the adjusters was all I had to do to make them work. Note that I do have a 277 rephase with a Megacycle cam. This cam has the same base circle as a stock cam. If you did this with a 360 engine you may need to cut a little deeper for assembly of the head cover. With the 277 firing interval there is a wider gap between cam lobes at one position of the cam that helps a bit with assembly.
Post by dps650rider on Feb 27, 2009 19:32:44 GMT -5
Well enough of the crap melted off my dirt road so I could get the bike to the pave and try it out. The valves are not silent, I can still hear them, but they are MUCH quieter. Can't wait to see how they are over the course of the summer. ;D
I didn't shorten mine.There seemed to be plenty of room inside with out.
75 XS650B with 79 forks and dual disc, braided lines, disc brake on back, Pamco ignition, Pamcopete's reg/rec mods, kill switch relay, home made harness, all LED turn, brake and tail lights, tapered head bearings, bronze bushes in swing arm, soon to get shock and fork upgrades
Post by tomterrific on Feb 28, 2009 8:57:48 GMT -5
I like cutting the top threads off the adjuster. It removes some weight right where light weight is most critical. The tip of the threads can be ground at a 45° angle to help get the nut started like the tip is shaped on the cut off threads.
dps, I thought about the noise you say you have and wonder if the elephant foot needs a different adjustment method. The oil in the ball and socket may have an artificial affect on the measurement. With the feeler blade in place, tightening the adjuster too tight and then loosening to adjust would squeeze the oil out. Just thinking, don't know if it is necessary.
Post by dps650rider on Feb 28, 2009 10:18:18 GMT -5
Tom, agreed on the weight removal. I cut them as short as possible for that very reason.
That could very well be a good adjustment method. However it could be they are not "silent" partially because they are new and wearing in and need to be adjusted again. Also, I am using an aftermarket cam and the recommended valve clearance is .010 and .012.
I was very impressed with the noise reduction on the short, 10 mile ride I took. Elimination of the valve tip wear I think will make a big difference as well because they will stay in adjustment better. I used to adjust the valves every 2000 (as opposed to the recommended 4000 miles) to keep them quiet.
Couple of years ago I added oilers to the intake valves.......they do run a bit dry....quiet now...other than that I think the Dam Yamaha built to prevent oil from slinging back was a bit obtrusive......always thought that a 1/4" groove cut in Dam would sling some more oil back to the intakes.......suppose they were a bit paranoid about oil getting out the vent.......my take is the paranoia was a bit overdone......the main reason the intakes are noise to begin with is that most of the oil (feeding from above the cam) is already slung forward...........xsjohn
Hi, just wanted to mention. I adjusted my SR´s valves this weekend, it has the Kedo screws, and they seem to be a drop in on the XS too, with no grinding etc. I have used them a couple of seasons now, with hardly no necessary adjustment, until now, but I only needed to correct the exhaust one.
John, I've looked at that dam quite a bit myself and tend to agree with you, The only trouble with modifying it is if you overdo it and get too much oil it would be harder to reverse.
FYI, I like the oilers you did. When I had it apart I was thinking one could also drill tiny holes into the oil passage to get more oil on the intakes but didn't have the guts to try it.
Its not a good idea to be cutting on that dam. If you think about it, the cam turns towards it and picks up oil to throw onto rocker arm. If you cut it down, you get more oil to base of valve spring and less oil to the rubbing surfaces. Blocking drain channel on exhaust side will give higher oil level and force oil to drain towards cam tunnel, thereby throwing more oil around top end. You could also tap the drain back holes on intake side, screw in restrictor plugs and keep more oil in there. I cut heads off Allen bolts and thread outsides, drill hole through center. Its easy to return to stock or drill out center hole if its overoiling
There are three types of people in the world, those who can count and those who can't I dabble in rocket science, when I'm not picking my nose
r80rt: :)This is a splendid write up, THANK YOU!!!!
Dec 26, 2015 16:54:05 GMT -5
mashermoto: What the what is this shoutbox for? Or should I shout, WHAT THE WHAT IS THIS SHOUTBOX FOR!
May 12, 2016 22:22:21 GMT -5
motormike: Good Day ...just a FYI.. Wild Cat is this Labor Day weekend. Still go'n on. A few 650's still make the scene. Various rides at different skill levels each day.. awards dinner sunday eve. BS in the park'n lot after dinner.
Aug 23, 2016 7:57:01 GMT -5
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Aug 28, 2016 19:45:17 GMT -5
kardon: Wow quiet here, where did they all go.
Oct 7, 2016 2:18:13 GMT -5
gggGary: XS650.com LOL
Feb 16, 2017 20:49:02 GMT -5
buell88: Anybody have any idea who built the xs650 tracker used in the Draggin Jeans Ad on Pipeburn?
May 16, 2017 16:24:09 GMT -5
joshua: The regulator/rectifier unit I got from Mikes PMA has closer hole spacing than original. Are we supposed to mill the holes to fit?
Jun 7, 2017 19:25:58 GMT -5
joshua: My bad. I found the bracket they supplied to mount the rectifier/regulator... Uh oh. How is this meant to work? Which way is it meant to mount? Looks like I have to use some spacers or something. Good instructions would be nice.
Jun 7, 2017 22:09:52 GMT -5
craig8johnson: Not sure if this is the right spot or not but oh well...
Jul 11, 2017 18:04:15 GMT -5
craig8johnson: I'm checking the charging system. I'm afraid I might have fried the last battery. With the solid state regulator (after market) what should it be charging at. The book says, I think, 15 volts. I'm hitting 17 when revved. Is that too high?
Jul 11, 2017 18:06:19 GMT -5
gggGary: Yes 17 volts is too high, about 14 volts is max, sounds like you don't have the right regulator or it's wired wrong.
Jul 13, 2017 6:54:33 GMT -5
dean: Just saying Hello, new member who is going to fix up a 79 XS650 that has seen its better days. I will definitely have lots of questions coming up.
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trix13: Hey everyone! New to the forum and am fighting those gremlins!! New charging system, ignition switch, coil and fuse box. Resistance is higher than normal on the ignition pick up so I'm trying to find one. No such luck yet.
Aug 16, 2018 8:50:48 GMT -5
trix13: Also, even though all of my connections are clean, I cannot seem to find out why , when at higher rpms, I hit the signals and the rpms pulse with the signals...hahah. same with the brake light. I appreciate all input!!
Aug 16, 2018 8:55:08 GMT -5
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adlpc: Hello all! Been enjoying your edifying posts and discussions - and as a fan of the XS650 since my early teenage years happy that I now own a 1980 Special which I plan to turn into a vintage half faired racer. Thank you all for being here!
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jimothyj: Hello everyone, I just joined & wish would have known about this site in 2014 when I brought my 1974 TX650A back from the grave. I have spent a good deal of $$ and alot of time on it. Just painted it and working on electrical, I will post pics soon,
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louisvan: trix13 - I had a problem with my 1975 SX650. When I got to highway speeds, the engine lost power. The problem was in the connectors. At a certain vibration and the wind pushing on the wiring loom, the connector lost continuity. A bad crimp to the wire.
May 20, 2021 1:19:09 GMT -5