'92 140,000Km rebuild.

[fj11.5]

dam, that looks better than new,,  how did you slot the cams, cnc machine? ?   ,,,i may just have to tidy up the exhaust ports,  just for fun 

[tmkaos]

dam, that looks better than new,,  how did you slot the cams, cnc machine? ?   ,,,i may just have to tidy up the exhaust ports,  just for fun  

Yeah Rod, I whipped up quick program and fitted them in between jobs..It was only 3 mins of machine time per gear. The photo makes it look like they are just slotted straight but they follow the same PCD of the original holes..

If you've got the head off I'd say go for a quick port job, hell you could make a difference even only with a rat tail file, just stay away from the valve seats. Might only be half an extra horse or you might pick up 2 or 3, either way, go for the win.  

The only bitch about the liquid suspension bead blast is now I have to drill out the blanked off oil galleries in the head so I can clean them out, then tap and plug the holes. But I think the end result was worth the extra hassle..

James

[tmkaos]

Ok so some more baby steps in progress..

Finished taking out all the steps in the intake and exhaust tracts in the head, and gave them a quick going over with a flap wheel to take off the high spots on the castings. It won't have made ahuge difference but for the couple of hours it took in between jobs at work I reckon it'l be worth it.

Intakes


Exhaust


Intake tract


Now I'm going through all the tapped holes in the head cleaning out the bead blasting material with a roll-tap. My, aren't there a lot of holes in there once you start counting? 


I still have to drill into the blanked off oil galleries to blow them out and clear them, I'll plug them after 1/8 BSPT, plenty of those around at work. It might be overkill but the idea of a whole bunch of minute particles of highly abrasive glass beads travelling around the inside my motor doesn't excite me..

And on a completely different note, my little baby girl Zara Fleur Daw is 4 months old this week.. She hasn't been properly introduced to the FJ yet.. But she has spent a bit of time asleep in the garage with me while I worked on pulling her apart.. 


Happy riding!!

James

[racerman_27410]

NIce..... pretty little girl ya got there... what does her name mean?   


KOokaloo!


Frank

[The General]

  Welcome Zara. Nice to see some young ladies join the forum. Am pleased ya enjoy the shed. Sorry you don`t have real koala bears over there nor The Barrier Reef etc, etc etc etc etc etc etc etc. . Would you like a nice lady to live with you, she could stay there and be your bestest friend forever,,,,You could call her number 11 but her real name is Julia. 

[tmkaos]

NIce..... pretty little girl ya got there... what does her name mean?   


KOokaloo!


Frank

Thanks, Frank.. we think so too.. 

We just liked the sound of Zara, and my wife's middle name is Fleur, which she actually goes by. And Daw, well, that's just my surname that they've been stuck with. :-)
We didn't go much into the background on the name but funnily enough, Zara apparently comes from the Arabic name Zahira/Zahrah which means flower, and of course, Fleur is French for flower.
I like the French tie-in because my parents are English, came over to NZ in 1969 and I turned up 10 years later, but Dad traced back his side of the family to the early 1600's when they came across from France to England as carpet merchants, of all things.

Anyway, we thought it all just sounded pretty when you said it, which we thought was important for a girl..

What motorbike starts with a ZF prefix? My wife and I have the FJ (Fleur and James), I could aways get her a FZR I suppose.. 

James

[FJSpringy]

but she is getting an FJ tattoo for her first birthday right  

[FJmonkey]

Don't forget FJ earrings and a Kookaloo (bling) necklace.

[tmkaos]

Okay back on topic - my valve lapping set turned up today, and I just had a quick go at lapping in a valve. I've never done this before, so how far do I need to go? 3 min of gentle pressure and rotation using #1 lapping paste has given me a shiny surface on the valve itself that is 1.5mm wide which is not quite uniform, there are small dots which I am assuming is very mild pitting. The finish in the valve seat in the head is the same.  This is an exhaust valve.

I would assume, without making an ass out u and me, that I need to get a uniform finish without grinding the valve so far down that I start changing the width of the seating angle.

Cheers,

James

[Arnie]

The Yamaha Service Manual (pg 3-17) specs the width of the sealing band as 1.0mm +/- 0.1 centered on the valve seat.  They further state that if its wider than that OR not centered you need to cut either the 30* or 60* angle to make it so.

hth,
Arnie

[JMR]

The Yamaha Service Manual (pg 3-17) specs the width of the sealing band as 1.0mm +/- 0.1 centered on the valve seat.  They further state that if its wider than that OR not centered you need to cut either the 30* or 60* angle to make it so.

hth,
Arnie

It's not a problem if the contact area is pushed towards the edge of the valve....all the performance valve jobs are done that way.

[tmkaos]

The Yamaha Service Manual (pg 3-17) specs the width of the sealing band as 1.0mm +/- 0.1 centered on the valve seat.  They further state that if its wider than that OR not centered you need to cut either the 30* or 60* angle to make it so.

hth,
Arnie

It's not a problem if the contact area is pushed towards the edge of the valve....all the performance valve jobs are done that way.

That's good news because it is definately towards the outer edge of the valve. I wasn't looking forward to having to recut valve seats at this stage of things where it's starting to go back together..

Cheers guys

[JMR]

The Yamaha Service Manual (pg 3-17) specs the width of the sealing band as 1.0mm +/- 0.1 centered on the valve seat.  They further state that if its wider than that OR not centered you need to cut either the 30* or 60* angle to make it so.

hth,
Arnie

It's not a problem if the contact area is pushed towards the edge of the valve....all the performance valve jobs are done that way.

That's good news because it is definately towards the outer edge of the valve. I wasn't looking forward to having to recut valve seats at this stage of things where it's starting to go back together..

Cheers guys

That being said the intake contact area is generally .040 and the exhaust .050. That is after having the seat cut. It would be nice to have the valves vacuum tested after your work. This can be done quickly on a Serdi

[bcguide]

Are you lifting the valve off the seat and giving it a 1/4  or 1/2 turn every once in a while or are you turning the valve on its seat for 3 min?
Scott

[tmkaos]

Are you lifting the valve off the seat and giving it a 1/4  or 1/2 turn every once in a while or are you turning the valve on its seat for 3 min?
Scott

No I'm popping the valve up and down off the seat every few seconds as shown here..
https://www.youtube.com/watch?v=fhXsH12Rg6s

I'm not going to recutting anything regardless of the width or position of the sealing area. The bike ran before, it'll run the same or better after they've been reseated and seal better. I'm running out of time to do any more fiddling.

Got the motor into the parts cleaner yesterday avo and gave it a first wash out. I'll have to do it several times I think. The fluids just been changed so it's nice and clean..


Cheers,

James