Rubber Engine Inlay replacement?

For those of you people out there that have seen my posts on this forum its not hard to see that i'm a newbie when it comes to bikes and am still learning about my own xj motorcycle, i don't know alot about bikes at all.

ok i own a 1981 xj650 that was converted into a chopper, in the engine there is what i can only describe as a rubber inlay as i don;t know its technical name, mine is highly corroded and has probably been in there since 1981!,i have been asked by the repair shop to try and find a replacement as my engine is in great need of repair as there's an oil leak.

Does anyone know where i can find a replacement inlay for the 1981 xj engine?..

 

If you dont know the name, can you take a picture? Some one here will know what it is. Then XJ4Ever will be able to help you out.

 

Hello Alza -

http://www.yamaha-motor.com/partviewer/?ls=sport

You can use this utility from Yamaha - punch in your bike model,
I can only guess you need a valve cover gasket??

 

thank you TIMEtoRIDE, i think yamaha's official site here covers it.
dunno why i could'nt remember this site before.

i think its the cylinder head (head gasket cover)?..

if this was corroded badly would this effect my engine alot?

edit) http://www.yamaha-motor.com/partviewer/ ... _-_1981%29

part 18

 

**CAREFUL** that looks like the paper gasket that also uses 2 "half moons"
Is your motor non-YICS ??

(also, corrosion and ugliness are skin-deep; they don't affect performance by themselves, but could indicate neglect and a need for a complete carb-scrub and valve adjustment)

 

i'm pretty sure its that part i linked too, the rubber part of the head cylinder its rubber and its highly corroded on my bike, i've not attempted to remove it etc i was warned by the repair shop about rubber corrosion in my bike;s engine.

i have no idea what non-YICS is or "paper gasket that uses 2 half moons" wth?

 

Just making sure you don't order the wrong part - post your VIN# and we'll tell you.

 

vin: 4K00004976
engine number: 4K04976

i have no intention just yet of ordering parts.. i will post some picks of my bike soon.

 

You are talking about the valve cover gasket. Looks like someone used silicone instead of replacing the gasket before. You bike looks like it is going to need a lot of work. From the condition of the exterior of the motor I can see the bike has been neglected outside. You are also running pods and a 4 into 1 exhaust. I doubt the carbs were rejetted for that combination. I would start by cleaning the carbs and adjusting the valves. If you can find a new stock airbox then put it on instead of the pods. Being a newbie this will be the best route for you to go. Don't forget to check the brakes either. Make sure the rear shoes are not delaminating and both front and rear brakes have plenty of material left. Change the oil with a good motorcycle oil and get a new oil filter and o-ring too.

 

That poor bike....

 

Hey the tank looks pretty good!

Seriously I'm in disbelief that will even run. Proof that these motors are tough little mothers, and that some owners really don't care about their bikes.

I would start with cleaning. You will need to halt that corrosion or things will get much worse. There are several inexpensive products you can pick up at the AutoPS that will stop that rust and clean your metal.

The valve cover gasket you need is readily available - XJ4ever on here has it as well as others. You can replace that gasket yourself it's not hard at all. Bigfitz has a write up on here that shows you exactly how to replace it. You should get a manual and begin planning your winter project - looks like you have some TLC to lavish on that pup.

 

ok thanks for the input. the oil filter has been changed quite a bit, i have no idea that it was running for "pods"? through 1 exhaust its been like that since i've bought it. brakes seem ok had them fixed end of last year.

 

yes its kept outside we can't all be millionares and own gargages/sheds!. the bike was going to get clean up end of last year before i broke my arm.

 

Sorry Alza I didn't mean you. I was talking about the previous owner(s). That didn't happen overnight. No offense intended and sorry about your arm-that sucks.

On a side note you could use a bike cover, or for less $$ a decent tarp would protect it. The anti-rust products will prevent moisture from penetrating as well or even WD-40.

I understand not having a garage believe me. I finally have one after being without for 10 years. I had a giant tarp hung under a porch to give me some protection for outside gear.

 

That valve cover can be saved; take it off, use Aircraft Paint remover to get the old clearcoat out of the way, and have at it. Some Scotchbrite and a boil in lemon juice will fix it right up; have a look: http://xjbikes.com/Forums/viewtopic/t=22125.html

You have a non-YICS (pre-YICS) motor; you need a new valve cover gasket and new "half moons" for the cutouts on the RH side of the head.

And as pointed out above, while the cover is off is an excellent opportunity to check you valve clearances; this is vital to the proper function and long life of the motor.

 

Yes, the '81 650 is a non YICS (Yamaha Induction Control System) motor. The two rubber cam end plugs that you need along with the gasket is part #19 on on the fiche.

You MUST check the valve clearances! With the motor in that condition it is very likely that the valves were neglected. It'll run fine without checking them right up until the valve burns and destroys your motor.

Next thing is a carb cleaning and re-sync after the valves are in spec.

BUT please do these two things first!

1. Get a shop manual. You will definitely need it!

And 2. Check the date codes on those front brake lines! Having the brakes "fixed" could mean a lot of things, but if those are the original lines you will have a big surprise when you need to get on them hard and they blow out, leaving you with no brakes and brake fluid all over your rear tire.

Please don't take offense at anything the members say about the condition of your bike, they aren't directing it toward you.

We just don't like previous owners (PO's) that never took good care of our XJs.

We all hope you get her back to healthy!

 

You got your hands full.

I fear you should do a thorough examination of what the Carbs and Intake Manifolds situation is before you get too far ahead of yourself.

http://www.ebay.com/itm/1982-YAMAHA-XJ6 ... 2315d9cc27

http://www.ebay.com/itm/1982-Yamaha-XJ6 ... 35b6feb982

You appear to have Carbs with damage to the Cast "Pillars" the Choke Activating Rod needs.
You may also need a Manifold or two.
THAT presents the possibility of needing to extract Manifold Bolts, which will complicate matters in a BIG way for you.

I think you should should take a "Square-one approach".
Do a Compression Test.

Find-out if your Bike is Cinderella and worthy of your love and affection.
Not one of her Ugly Step-sisters with some terminal ailment you should know about before taking her shopping.

 

Just some more info for the guys...

4K0 = 1980/81 European XJ650, same as our 1982 XJ650R Seca.

Sold from 1980 to 1984 in the UK

Chacal has your bike listed as an '80, but with that high of a serial# it probably is an '81.

Sorry, it didn't dawn on me until I seen your other post and seen the dual front disc brakes. And sorry about freaking out about the brakes, but they are a major issue on these XJs. Yours looks to have had stainless lines installed.

Better pics of the bike in question HERE


Same rules still apply though.

 

i do have a outdoors cover for it but it does'nt help much, i live next to the coast bearly a mile and the sea salt air really takes its toll!. i'll try and hide the bike in the garden shed this winter all though its the councils shed and its prohibited to store and motors or that kinda of equipment in there.

used wd40 all the time helps when trying to start it up.