Engine Rebuild: Valvetrain Components Available?

[chevy45412001]

p.s.

I dont know about that place they actually list all kinds of stuff for the xs-xj bikes. mostly cables , clutches ,brake pads,a few exhaust systems(jardine and mac) , headlights, turn sig stems, levers,master cyclinder rebuild kits,steering stem bearings(xj only listed) ,valve shim tool , replacement seat covers, seat kits , Theese are all things that at least in 2003 catalog they were selling for xs-xj.. there is more but you get the point.

[MartyA]

So these are all the same?
Exhaust valves from the Yamaha parts fiche:
78 XS1100 E IJ7-12121-00-00
80 XS1100 G 385-12121-00-00
83 XJ750 K 4H7-12121-00-00
84 FJ1100 L 36Y-12121-00-00
87 FJ1200 B 36Y-12121-00-00
91 FJ1200 T 36Y-12121-00-00

If I find a listing for exhaust valves for a 91 FJ1200 they will fit my 78E. Cool!

[Shuriken]

I have a '78 parts bike with about the same mileage on it. I will have to look at it and see if what condition its valves and head are in.

I'll call Dennis Kirk with those part numbers and see if they have anything. They are cheaper than OEM.

Ben

[John]

A question on the FJ valves. My wife rides an FJ11, and it has four valves per cylinder. The valves are smaller than those in the XS...aren't they? They'd have to be in order to stuff four of them in the combustion chamber. According the FJ manual, one of the valve seats is only 1 inch in diameter. I don't know the size of the valves in the XS, but surely it's bigger than 1 inch.

[randy]

This is getting a wee bit technical, and I've never seen an FJ head. I defer to those with more knowledge

Randy

[Geezer]

Originally posted by John
A question on the FJ valves. My wife rides an FJ11, and it has four valves per cylinder. The valves are smaller than those in the XS...aren't they? They'd have to be in order to stuff four of them in the combustion chamber. According the FJ manual, one of the valve seats is only 1 inch in diameter. I don't know the size of the valves in the XS, but surely it's bigger than 1 inch.

You're right on the money with the FJ valves being smaller. It's been many years since I worked in a Yamaha shop but I'll bet some of the single cylinder quads used the same (or almost the same) valves and pistons.

There is a lot more parts interchangeability than bike companies wants people to know about.

Years ago when I was working in a Kawasaki shop we took a quad in trade that had a bad starter. I pulled it apart and the brushes were toast. We didn’t have that part number in stock but I spent 5 minutes searching through the parts shelves and came up with the exact part with a different number. I’ve seen this for valves and other parts as well on Hondas. The problem is that if you don’t work in a bike shop, these comparisons are hard to make.

Geezer

[John]

Valve sizes

I just finished reading one of the articles posted on the left side of this page, It was from March 1980. It mentioned the fact that the both valve sizes were increased by 2mm in 1980 vs1979, so in theory the valves from a 78-79 will be too small for an 80-81, and possibly for an XJ. It also mentioned that the lift had been increased on the exhaust side , by.05 mm to 8.8 mm. The lift on the intakes had been left alone, at 8.8mm. Was that done by using a different cam or by the decrease in the valve clearance changes made in 80? The clearance was changed by.05mm in that year.

[MartyA]

John said

"My wife rides an FJ11, and it has four valves per cylinder. The "valves are smaller than those in the XS...aren't they..."

That in part is why I listed the EMPART part numbers for all those exhaust valves. I was hoping someone was sure and could explain about the numbering. Unfortunately there are only part numbers listed, not dimensions.

John, you are probably correct. There is no way you could fit 4 78E valves in a 78E head. They take up more than 50% of the surface, IIRC. If the head is about the head in the FJ is about the same size as the XS, the valves have to be a lot smaller.

So I guess you can't go by the parts fiche numbers as a good cross reference.

[Shuriken]

Its in the 2003 Dennis Kirk metric catalog.Page 486 , Intake part #18-0027 That is for 82 xj-1100 and 80-81 xs-1100 (all). And part # 18-0028 exhaust for 82 xj-1100. And thats all i see. Hope this helps a little.

I just called Dennis Kirk. The intake valve is no longer available - they won't be selling it anymore. The exhaust valve is listed as obsolete with no replacement.

With carb jets being discontinued and valves NLA, I am really starting to think I won't be able to rebuild my bike, unless someone knows of a stock of valves for XS11's.

Ben

[chevy45412001]

If thats the case ,I'd better keep my spare motor around. It's only got 8,000 miles on it.

[pgg]

I experimented with both model cams in a 78E, the later model cams had less duration and more exhaust lift and are an improvement for everyday riding. I also had the later model valves (slightly larger) reseated into the 78E head. No-one need worry about not being able to rebuild their XS11 - you can have the cylinder head components altered to any specs you like.

[DEmily]

I have no resources of micro fishe, but Zanotti's motors was able to get every part I ask for at a much cheaper price than other's, including some parts that my local Yamaha dealer claimed they could not get. They give good discounts if ordering via internet. I believe I paid $19 each for intake and $25 each for exhaust. Just email John at Zanmot@aol.com and tell him what you are looking for. Good luck.

[Shuriken]

I checked with Zanottis. They didn't have any in stock and said Yamaha listed them as backorder with no in stock date.

I'm investigating other sources right now. Found one but the price for 4 intake and 4 exhaust valves is over $250.

I know that Vesrah makes replacement xs11 valves but I don't know who is carrying them - Vesrah is the manufacturer and sells to resellers.

Ben

[Shuriken]

I found a place. I think they are selling Vesrah valves. Vesrah sells to a ton of people - who in turn sell to others. We pay the price at the bottom of the line.

Zanottis seems to have the best price. They told me they were out of them however. I'm trying another place I found. They seem to be less professional so I hope I get what I pay for. I think the total will be right about $200 after shipping. That includes 4 intake and 4 exhaust valves. I haven't seen the head yet but know that the valve clearances are tight and that the bike looses PSI from the valves and rings.

In the best case scenario I could order new rings and install them instead of the piston kit.

We'll see.

ben

[TopCatGr58]

Originally posted by ae7f
I haven't seen the head yet but know that the valve clearances are tight and that the bike looses PSI from the valves and rings.

In the best case scenario I could order new rings and install them instead of the piston kit.

We'll see.

ben

Hey there Ben,

Aren't you putting the cart before the horse!? Why are you bothering to go thru all of this trouble and research for valves that you may not even need? Pull the head, then either take it to a machine shop and have them check and grind the valves and seats, or save even more $$ and lap them yourself!!

As for putting in new rings into an old cylinder, that won't necessarily do much for you, cause it's the cylinders that get worn out more than the rings, which increases the distance/clearance/tolerance between the piston and cylinder, especially as it takes on an oval shape, and that's why you loose compression and such.

Put your money into the piston/ring/bore kit, and get a simple valve job. Most of the time they can be reground to salvage them, vs. having to fork out for new ones!! Just a thought!
T.C.