Camshaft Timing

[steptoe]

I wouldn,t be to worried about them just yet John,,,  mine have done 80 000 klm  and almost 10 yrs with no sign of  lieing down yet

[hen]

OK so Performance means Replacing more often so my Wiseco pistons and rings when should I replace???

[AussiXS11G]

apparently..........
20k km is considered a lot of kms for a hot camshaft.....
M Pitman tells me that they changed hot cams on their race bikes after 5k kms....it's about "ramp speeds"
and the production race bikes were changed after 4.5k km to 5k km - that's the whole bike, not just the camshafts...
soooo.... It is amazing that mine lasted as long as they did without the end plugs...

[Eveready1100]

Still doesn't answer the question as to why the lobes were fekked, but the journals were ok. Plugs or no plugs.


 ^ Dodgy scan shows the oil flow through the motor. It comes into the head via the external pipe and feeds into the cams via the two inner journals. The oil then supposedly is trapped inside the cams where it leaks out through the other journals via the tiny holes in the cam bearing face. If the end plugs are missing, the oil will flow out the end of the cams then runs back around the buckets on its way to the camchain tunnel where it gravities back to the sump. The cams lobes and buckets would've been getting a good wash from the oil flowing over them, so I really can't see the camshaft manufacturers point. The lobes just mustn't have been hardened after being machined.
Bryan, what shape were the shims in? They'd have to show marks from the alleged lack of lubrication where they contact the lobes.

My only real concern would be that the oil pressure would've been scary low at times, with the plugs missing and that the journals at the far end of the cams might've been starved of oil.

[AussiXS11G]

hey Hen....
back in 2001ish I sent my cams to Ivan Tighe to mod them - he evidently removed the plugs to do the required work and
never mentioned the plugs, I knew no better, forums were not known to me, they are not shown in my manuals, so I installed
the cams as they were returned to me......
'nuf said......

[hen]

They do look like a destroy to get out item. Why where Yours taken out Bryan ? 

[steptoe]

there are plugs in the end of them,, Ev was over the other day and we still have the flood motor apart,,

they kind of look like welsh plugs, and are set well in from the end,, would probably be a real pain in the ,,,,,, to try get them out

[hen]

triple j here 
If anyone has a cam out for inspection, can you see through it end to end like a piece of pipe?
or are the ends blocked with a plug

Checked my spare they are pluged and remember seeing plugs listed onhttp://www.cmsnl.com/yamaha-xs1100e-1978_model8671/partslist/A-11.html#results and they have them 

[Fred]

Hey Guys,

I'm looking at my original:
 
Yamaha Parts List
for model XS1100E
for Australia
and New Zealand

published by the
YAMAHA MOTOR CO. LTD

and it shows the same schematic as Jeff's NW Vintage post with the same parts number for the plugs but description listed only as "Plug".

It's been a long time since I was in the top end but I do seem to remember the plugs being worn so I replaced them with the rebuild at the time.

Sorry I can't be of more help but I hope not to go back in there for a while again.

[XSNT999]

Hi Triple J

I was talking to Mal Pit today about this issue and he says the plugs were only ever listed in the original 'E' model parts book.

Part number 90331-10011

He has four left over after he finished rebuilding my engine if anyone needs them.

I hope this helps.

Cheers

[Jonesy :-)]

triple j here 
If anyone has a cam out for inspection, can you see through it end to end like a piece of pipe?
or are the ends blocked with a plug

[Eveready1100]

Bryan, here's the fiche diagram off the UK site. No plugs in sight.



I do see in this one that it's got Yamaha Motor Corp. printed as a background, so is the original diagram.

[AussiXS11G]

has anyone seen these plugs before?
not in either of my machines.....not in the manual or they would be in there I assure you...

[Eveready1100]

Agreeing totally with Jonesey/Jonezy / J2 ?? on the effects on lobe wear. Even without the end plugs in, the oil flowing out the ends would have to find its way back to the sump by flowing back past, and over the cam followers on its way into the cam chain tunnel. The cam journals, however, stand a better chance of being damaged through lack of oil pressure.
Obviously, those areas weren't affected too much as Bryan's still using that head.

[Jonesy :-)]

have you still got your old buggered cams? is there any a them plugs in ém?
I'm agree'n with the what's the effect on lobe wear thing too, can't see it.
theres gotta be enough splash lubrication to look after that side of things