valve springs

[Guest]

from reading our Bill Silver bible on motor repair guide, page 51 says that some tuners have used valve springs from Yamaha 750-850 triple as a substitute. <br /><br />while a Y part number would be great, i would love a Y year and model number.<br /><br />any info?

[kustommusic]

Perry, I am a memner of the Yamaha triples forum,Mabey you could try their board,it's very active I'm sure someone could help. WWW.yamaha-triples.org<br /><br /> Sorry I dont know how to make that a link but that is the addy. Kustommusic

[sprocket]

Good and bad news : I checked with the local Yamaha dealer today and the springs are no longer available. So why am I listing part numbers you ask? Dunno, but here they are. <br />All numbers for the 1979 XS750F and the 1981 XS850H are the same. Outer spring #90501.39414.00, inner spring# 90501.28415.00, exhaust and intake are the same. Perhaps someone with mentioned Yamaha Club could be of some help.

[Guest]

well, at least we are getting good technical info<br /><br />i sent Bill Silver an email thru the ask an expert.<br /><br />his other two resources were,<br /><br />http://www.westernhillshonda.com/<br /><br />and <br /><br />http://www.megacyclecams.com/catalog/page23.pdf<br /><br />but you have to understand, i bought a '67 CB77 with a holed piston, 19,xxx miles; for $50. yes, 50 bucks<br /><br />after o-rings, gaskets, one size over pistons and rings, books, catelogs, manuals, i have another 2-300. i don't want to dump another $168.50 for springs.<br /><br />let us find another resource.

[georGe]

Sounds like ya got a bit of a bind...LoL <br />what are ya looking for stock springs or the Yam. subs. ? <br /><br />georGe<br /><br /><br />

[Guest]

i have a '67 CB77, with 19+k on the clock. it sat for the last three years.<br /><br />what i have is probably shot, and was looking for replacements for stuff that was out of production.

[tommy]

Perry,<br /><br />Your post is confusing to everyone.<br />You start out sounding like you want to upgrade your bike.<br />Then, you seek expert advice, but don't want to pay the price<br />for the answers you get. Then the topper, your valve springs<br />are &quot;probably&quot; no good!<br /><br />Are those springs good or arne't they?<br /><br />Your &quot;deal&quot; involved two choices. Paying the price or being<br />resourceful. AND being knowing of what you do and do not need.<br /><br />The 305 family is &quot;dead heading&quot;. it's coming to it's end.<br />Thats what makes things difficult, as evident in your posts.<br />And thats what parts bikes are for ... uh ... parts!<br /><br />For starters, get yourself a micrometer. Harbor Freight<br />Tools, (Northern Tools in the east), offers a decent digital<br />mic for $19.95, on sale. Measure your springs. They &quot;may&quot; be okay.<br /><br />The outer should be no shorter than 1.653&quot;. Inner, no shorter<br />than 1.417&quot;. Check on a level surface, using a square, that<br />no springs are cocked, (leaning one way or the other).<br /><br />If they measure up, then use them. If you want to double check,<br />take them to a dealer to measure compressed height/tension.<br />For that test, outer is 75.9 to 76.3 Lbs at .964&quot;<br />Inner should be 39.7 to 44.3 Lbs also at .964&quot;.<br /><br />When removing springs from head DO NOT over compress them,<br />compress just enough to remove the keepers.<br /><br />That said, if your springs really are no good AND you have<br />not gotten a parts bike, then write me at Netvoikguy@Earthlink.net.<br />Maybe I can fix you up with a usable set of springs ... you<br />pay postage though.<br /><br />tommy<br />