1982 XJ650 RJC Seca (Stock Jetting)

Well..since we talking about jets. I'm brand new to the XJ world and I just bought 1982 XJ650 Seca. I have an RJC frame (I'm in Canada) and the engine numbers don't match, so I'm not sure if the motor is the Canadian version or not? It's non YICS as well, has an oil cooler and double front disc brakes. Anyway......back to the jets. I cleaned my carbs a few days ago and found that the Main jets are #112's and the pilots are #43 and the jet needles are Y-11 except for the #4 carb which has a Y-10 for some reason. The pilot air jets are #195's except for carb #2 which has a 205 and........the main air jets are #50 oh and also
I have the air compensator jets on the intake side and they are #36 and of course one carb is missing one. I would like to set the carbs back to stock for Eastern Ontario conditions. I'm hoping you guys have suggestions for stock jetting and needles. I'm thinking that I should go #110 mains, #40 pilots, but I'm really not sure about the needles??

K-Moe, you were absolutely right, I opened up internet explorer instead of google and voila! Thanks!

Chacal - My engine #5v3-000188 and my frame is a 15U number. I should aslo mention that I have the Hitachi carbs but I didnt see a model# anywhere oon them. I'm pretty sure they are the 32mm though. I know I shouls have got the caliper out and taken a measurement, but I didn't.

 

Where in Eastern Ontario, Curtis? I'm right on the big river!

 

MODEL NAME: XJ650RJ
STREET NAME: 1982 XJ650 Seca
MODEL ID CODE: 5V3
FRAME ID: 5V3
SERIAL NUMBER STARTS AT: 000101
NOTE: these bikes were always painted quartz silver, and did not use a YICS-equipped engine, but instead used the 1980-81 style non-YICS 653cc engine.

MODEL NAME: XJ650RJC
STREET NAME: 1982 XJ650 Seca Canadian
MODEL ID CODE: 15U
FRAME ID: 15U
SERIAL NUMBER STARTS AT: 000101
NOTE: these bikes were painted silver or red, had a YICS-equipped 653cc engine, and were probably not released until very late in the 1982 model year. Some of these bikes may have come with a factory-installed oil cooler.


Sounds like some mixed-and-matched carbs from different models. Probably the best results will be using the following combination of components:

Main fuel jets #112
Pilots fuel jets #43
Main jet needles Y-11 or Y-12
Main air jets #50
Pilot air jets #195


- the Y-10 needles (XJ650 models) are "skinnier" at the bottom of their shaft than either the XJ750 Y-13 or Y-14 needles. Thus the Y-10 needles are "richer" than either the Y-13 or Y-14 needles, although the Y-20 (XJ700) needles are even richer, but only at wide-open throttle positions.

- the Y-11 needles (XJ650 Euro) are a bit leaner than Y-10 all the way through the rpm (needle position) range, especially at wide-open-throttle position. They are a bit richer than Y-13 needles, except at the wide-open-throttle position.

- the Y-13 needles (USA XJ750) are "richer" than the Y-20 needles (XJ700) throughout the rest of their overall length.


Unfortunately we don't have any info on Y-12 needle characteristics since we've never had any of them.

 

I live in Johnstown, just minutes from the bridge to the US Of A. Maybe we can ride sometime? Or just shoot the $h!t about xj bikes??

 

Ok Chacal, I like your suggestions especially because the bike already runs really good. Throttle is responsive all of the way through the range.
So that being said I would to order these parts from your store. Also do you carry the float height measuring tool?

 

Curtis, yes we do, although we strongly suggest that you use the clear-tube method of measuring the FUEL LEVEL (rather than relying on a mystical "float height" reading):

http://www.xj4ever.com/setting fuel levels.pdf

Just send an e-mail to us for all of the information regarding prices, availability, ordering: info@xj4ever.com

 

Ok here is the poop on Canadian xj seca

Silver bikes early release July 81 xj650rj
-oil cooler
- non yics
Red bikes release sept 81 xj650rjc
-oil cooler
-yics motor red bike numbers 15U-...
Ps
Had a new one and sold a few dozen at Yamaha dealer

 

Hey TMB, wow that's some interesting info..................so the red bikes came out that soon after the regular '82 models were offered? I thought the red bikes were an end-of-the-model-year attempt to offload extra bikes......

 

We had seen them in UK bike mags and asked Yamaha at the 1980 dealer meeting why we don’t get them.
The said they had thought about it but due to small Canadian market they passed. Then all through spring 81 dealers across the country kept asking when. Late June we got news that some early ones are on the boat.
I started taking pre orders and had sold 10 in the first 5 days ( staff at 3 locations took the first 4).
Mine was the first one on the road in Canada the morning they hit the dock.

 

The 2 XJ650RJC’s I have are both made 11/81

 

That’s normally when they are made for the 82 model year between sept and December and what are your serial numbers ?

 

15U-000435 & 575

 

Ok so that makes sense the first few hundred may have sept production date or my recollection is of a month or so off. Or they announced them in September but didn’t show up till later.

 

I'm in Cornwall, just seconds from the bridge. I don't ride anymore, big shoulder injury combined with small disability cheques forced me to sell my bike. It just rolled out of my life this week.

 

Toomany, so is it true that the RJC models could have been red or silver? Or just red? Both RJ and RJC models (in Canada) came with the oil cooler?

 

Every red one I've ever seen has YICS.
Every silver one is non-YICS

 

I was hoping my RJC supplementary manual would mention paint code(s) but there’s not much in this.

Did any other markets see a 650 Seca with YICS motor besides Canada?
One other question- can you even mount an oil cooler on a non-YICS bike? It appears that the mechanical tach cable would interfere. I assume all YICS come with electronic techs.

 

You can, on US 650 Seca models it's easy (direct bolt-on), on Maxim and some 750 models it's a tiny bit more involved as you have to add the upper cooler peg mounting bracket. The correct 650/750 oil cooler is short enough so that the tacho cable does not interfere.

 

My Seca 650 has a build date of 06/81 Frame code 5V3 000576 engine # 5V3 000576. It is a YICS motor. It has an oil cooler, and dual front disc brakes. Paint is grey/silver. I'm a little confused as it seems to have a US frame/engine code, but Canadian specs. I'm not the original owner, but to the best of my knowledge the bike is not a US import

 

A 5V3 is a Canadian model RJ:


MODEL NAME: XJ650RJ
STREET NAME: 1982 XJ650 Seca
MODEL ID CODE: 5V3
FRAME ID: 5V3
SERIAL NUMBER STARTS AT: 000101
NOTE: these bikes were always painted quartz silver, and did not use a YICS-equipped engine, but instead used the 1980-81 style non-YICS 653cc engine.


USA models had a 5V2 frame and engine code.

I'm a little surprised to hear that it has a YICS motor, though. It was my understanding that all the silver bikes (5V3 models) has a non-YICS engine, and all the red 15U models had the YICS motors.........

 

Well mine has definitely been pieced together. I'm not sure if I even have the standard handlebars and master cylinder? Runs good though, all things considered. I have not checked compression on it yet either, but even with the carbs not being quite right it still has good power throughout the throttle range. At lease to me anyway, I've only been riding it for a couple of weeks.

 

Do you have a working tach? In which case someone also swapped out an electronic one when they swapped the YICS motor in.

 

Yes I do have a working cable driven tach. I think it's safe to say she's a bit of a Ba$t@rd bike, but I kind of like it.

 

I thought all the YICS heads were missing a mechanical tach drive?

 

Then it's not a YICS engine............unless there's some "missing link" in the engine evolutionary chain that no one is talking about.

 

I just traded a Turbo YICS valve cover for a non-YICS 650 valve cover for my naked turbo project.
The donor non-YICS bike will now be sold on to some unknowing individual. He will read YICS on his engine, LOL.
Also, since the crank end caps are all interchangeable its possible they've confused a few owners as well.

Below is my spare Turbo motor with the non-YICS cover set in place. Sitting to the left is a Turbo.
It's a puzzle to me why the valve covers for the non-YICS 650 interchanges with the Turbo which has YICS.
The standard YICS 650 is different.
I wanted this cover because it looks much tidier and I don't want YICS written anywhere.

 

I looked closer at my bike and you're correct it is a Non YICS motor. I guess at some point the right side crankshaft cover was replaced with one from a later model.

 

What jet sizes and needles are you running in your carbs? do you live in Canada? I'm running #195 mains, #43 pilots and Y-11 needles. Or I will be once my parts arrive. Just curious, I'm slightly worried that the Y-11 needles might be too lean.....maybe I'm just paranoid. I have the fuel air mixtures screws all set to 3 turns out right now. I'm going to check float bowl levels and sync the carbs once I get the new parts into the carbs.

 

Mr. Spares Along is from Kamloops. If you click on his avatar, it brings up member info.

 

Hi Curtis, I'll be overhauling the carbs this winter and will let you know what needles and jets are in them.

 

FIRST, I'd like to say thanks to Len (Chacal) over at XJ4ever. I received a few parts from him a few days ago and they arrived in good time and condition! I had my carbs apart today and installed my new y-11 needle #195 idle jet and #36 air compensator jet. Tomorrow I will check float bowl levels, put carbs back on the bike and then......sync and colortune carbs. I'll let y'all know how I make out!
Thanks again Len (chacal) for the parts, I will be buying more stuff from you in the near future. What an awesome resource!

 

Awesome! enjoy the tear down. I've had my carbs apart three times plus.......Its a little bit of messing around to get the fuel level right in the carb bowls. I think I'm close now, but could stand another 1mm to .5mm to be right on the nose. Anyway I'll be interested to hear what your running for jets and needles once you get those puppies apart.

 

What are those plates mounted on top of the valve cover?? Just curious.

 

The Turbo has air scoops which directs air down on the head

 

Awesome! Thanks.