[elime]

I used my last two valve cover gasket o-rings on my "new to me" second TW and decided I better get some more. I went to Ace Seal here in San Jose and for $5.25 I got 23 of them (Yamaha wants $9 each). I asked the clerk if the part numbers they used were universal and he said they are.



The Ace Seal part number is: 2-140

Description is: N-70

I think -140 will work. (As in "dash one forty")



I used these o-rings on my other TW . I have adjusted the valves w/o replacing the gasket and there has been zero leakage!



Google "o-rings for sale" and save yourself some dough.



If anyone knows the size numbers for other o-rings used on the TW please post them here. We all could benefit.

 

[lizrdbrth]

N-70 indicates nitrile material. Oil and fuel resistent, handles up to 250F temps.



O-rings are made of several materials and if you know the designators you can get anything you need.

 

[elime]

I replaced some o-rings on my new to me second TW because of seepage. Here are the part numbers and how they fit (IMHO).



Cam sprocket cover o-ring: 2-155 N-70

O-ring is a little short but will stretch to fit and should work well. .36 cents each.



Drain plug o-ring : 2-221 N-70

Excellent fit. 19 cents each.



Large oil filter cover o-ring: 2-227 N-70

O-ring is just a teeny tiny bit to big but can be used. It should work well. 21 cents each.



Small oil filter cover o-ring: 2-108 N-70

Replacement is a teeny tiny bit to small but should work well. 6 cents each.



Valve cover o-ring: 2-140 N-70

Excellent fit. 21 cents each. Remember to order at least two of them.



Small blind plug o-ring: 2-113 N-70

Excellent fit. 18 cents each.



Big blind plug o-ring: 2-124 N-70

Excellent fit. 30 cents each.



Plastic cam chain adjusting cover: 2-115 N-70

O-ring is a little large but can be pushed into the groove and stays there. 18 cents each



Plastic oil fill plug: 2-116 N-70

O-ring is a little small but stays on plug when unscrewed. 2-117 is larger but will fall off. 18 cents each.



Starter housing o-ring that seal starter to engine case: 2-120

Excellent fit ! Should last a very long time and only costs .11 cents each.



Carburetor float bowl gasket: 2-037

2.5" in diameter and 1/16" cross section. Seems to fit well enough but you have to use High Tack gasket sealer to hold the o-ring in place. $.70 each for Buna (Nitrile) and $2 each for Vitron (better in gasoline)*





*(1-9-'14) I think Ace Seal has wised up and is charging more to people that just buy a few o-rings at a time. Grainger is cheaper per o-ring but you have to buy in quantity.

I bought them at Ace Seal. www.aceseal.com They do mail order via email or phone. $15 minimum order for mail order -- no minimum if you walk in. I don't know about S&H.



I spoke with a guy that works there and he said if I wanted to upgrade o-ring material (higher temperatures) then to go with the Flourosilicone (L) or the Viton (V). The cost is 3 to 4 times greater than the Nitrile (N).

 

[elime]

Sealing worn o-rings with blue RTV didn't work. Lots of seepage!

 

[elime]

O-ring for cam sprocket cover was a little short.

But could be stretched to fit.

 

[elime]

Small o-ring on oil filter cover is smaller than the one I found in it. The one I found was flattened and maybe that makes it look bigger. I think the new one will work out well even though it appears smaller, and if it doesn't it is easy enough to change.

 

[elime]

Drain plug o-ring and large o-ring for oil filter cover. They look good to me but were a slightly different size the the ones I removed. Again, if the leak both are easy enough to change.

 

[qwerty]

Use the search function. I've already posted all the o-ring sizes need for regular maintenance somewhere. Be careful--if you buy top quality o-rings in appropriate materials the prices can match online OEM sources. Really cheap o-rings may fail in extreme hot or cold operating conditions, depending on the material.

 

[phelonius]

Now that is a useful information thread. The world needs more of those.

 

[elime]

Four more o-ring sizes have been added to post #3.

 

[pantera1]

Good info



Thanks