QUESTION FOR XJ650RJC (Canadian) Seca OWNERS:

Hi, first time here. I own a 1982 XJ 650 RJC which I bought in the Netherlands and turned into a caferacer some years ago.
The vin number is 15U000350 and is matching on frame and engine. It is the yics version and according to the papers it is a 653 cc.
The bike really runs well, but as for 2 weeks ago I noticed the cilinder head gasket is sweating, it is now time for a valve clearance adjustment plus gasket replacement. I contacted some internet web shops for a complete gasket set (cilinder head gasket, cilinder head cover gasket, base gasket and some other stuff) but they cannot really assure me they can deliver the appropriate set, since RJC stands for Canadian version.
Can anyone help me with this ? Part number ? Where to buy ...

I found following valve clearance specs which I thing are correct :
Intake (cold). 0,11 - 0,15 mm
Exhaust (cold) 0,16 - 0,20mm

Thanks,

Eddy

 

Contact Len at xj4ever or @chacal on the forum

 

those are the correct numbers

 

Hey all ... First post. Glad to finally be here. I just picked up an 82 XJ650RJC in near mint condition 15U-000321 /// \\\

 

Hi Chacal how do l know whether l have a YICS engine on my XJ 900 f thanks?

 

My XJ900 f inlet stub bolts are // \\ so is YICS Chacal.

 

YICS was an 81, to 86
YIKES!: ALL ABOUT THE "YICS" SYSTEM.
from above link

"YICS was used on:

* all XJ550 models
* all 1982-up XJ650 Maxim and Turbo models
* all XJ700 non-X models
* all XJ750 non-X models
* XJ900RK
* XJ1100 models."

 

Thanks XJ550 mine is a 1991 machine has YICS on the cam cover. Going to read the link now.

 

Is the XJ900RK the machine with the anti dive on the forks and the handlebar mounted fairing? My bike has YICS on the valve cover but no YICS stickers on the crankshaft end covers.

Good video showing the YICS ports and the before and after cleaning.

 

yes it is. the 83 xj900 seca. any crank end covers will fit someone probally broke the plastic originals and used the plain covers from the 650 non yics

XJ900RK

 

maybe the cam covers are interchangable

 

I was wondering what the differences in carburettor setup is between the XJ900RK and the XJ900f? I know from the write up the 650 had larger air jets on the YICS engine to lean the mixture in comparison to the non YICS engine. Is this the same on the XJ900RK engine?

 

Yes l think you are right l am sure I have a non YICS engine. It possibly is not the original valve cover.

 

My engine number mark on crankcase is *4BB-001114*

 

4BB00 = 1991 XJ900 Europe

 

Yes the registration document states the engine number is the same as the frame number but it is not so I am not sure if there is an error in the documentation or I have a different engine. Bike has had six PO's but I bought it because mechanically it was in great condition just needed a tidy up. I am putting it back together just now, there was surface corrosion on the frame so I stripped it all back to bare metal and painted it. I have rolling chassis now so I need to do some work on the engine now and get it back on the road.

 

I’ve never seen interchangeable covers between YICS and non- YICS

 

I am not sure hogfiddles to be honest my cam cover has YICS on it but the engine is too late to be YICS I think.

 

this is a 750 the bolt you see hnder the head on the cylinders is on both sides and is the yics port


this is supposed to be an 89 xj900 motor looks like a YICS port do not know

 

a 900F should be a YICS engine. However, most '85-later engines no longer have the YICS emblem on the round oil pump covers; they either say nothing at all, or, many of the 900 engines had an emblem (same size/shape as the YICS emblem) that said "DOHC".