Carburettors

Could someone please identify these carburettors , they are from my brothers xj750 trike he has recently bought . They are Mikuni and have the numbers 130 stamped inside, we need to repair one and think it might not be an xj750 engine .
Any help greatly appreciated.

 

There are experts here that should answer you shortly... then there is me!

Looking left to right on the picture of the bowls (bottom of carbs), the 1st and 3rd should be swapped. You want the drain screws facing out.

Here is a good read: https://www.xjbikes.com/forums/threads/in-the-church-of-clean.14692/

 

Thanks very much for your help.

 

My carbs are only firing on the two outside one's any idea's why? Got sparks and new coils

 

Stump told you but you're ignoring his link.
Read the church page, it will provide very useful information for your problems.
You're suspecting a fuel problem and I would agree. Time to dig into your carbs.

 

We have just found out that the engine number is not the original xj750 and has been replaced by a bigger engine . Now need to find out what engine and carbs we have. Also no sparks at the second and third cylinders .

 

What is the engine number that is stamped into the ID plate (behind the clutch cover)?

see page 4:
http://www.xj4ever.com/catalog/frame-engine-id.pdf

 

Those looks like the Mikuni ones from a maxim “X” that are on my bench. Enrichment plungers horizontal. Carb hats have high tops.
This is the xj700xn(us model) or Xj750xn (Canadian model) “X” water cooled motor.
Only thing bigger is the xj900 air cooled engine.

 

Mark is in the UK so likely a 750 RL or 900RK so mikuni’s make sense. Maxim-X pretty rare there. They do have gray imports though so still possible

 

1985/86 xj750? If it's prior to that, the carbs should be hitachi..........so we need to know what the actual engine in it is. If it's bigger than the 750, it's probably a 900, but that's why we need the number that Chacal asked for.

 

My 84 750rl has hitachi carbs.

 

Now I'm confused. I thought the 84 750 RL was just a downsized 900 which would have mikuni.
Now I understand why you suspected 750X

 

'84 xj750rl is basically a 900rk, bbbut has a 750 engine in it. The x750rl also has Hitachi Carbs, NOT mikuni
---
Years & Models: 1984 XJ750RL Seca models
Carb Manufacturer: Hitachi
Carb Series: HSC33
Carb Model ID: 41Y00
Main FUEL Jet Size: #106
Pilot FUEL Jet Size: #40 or #41 (unsure which is correct)
Main AIR Jet Size: #70
Pilot AIR Jet Size: #225
AIR COMPENSATOR Jet Size: not used.
Starter FUEL Jet Size: #43 (non-replaceable, in float bowl)
Main jet NEEDLE ID: #Y-18
Main needle JET Size: #3.2mm (the main needle JET is also known as the "power valve" or "emulsion tube").
Fuel Level in float bowls: 1mm +/- 1mm (.039" +/- .039")
Idle RPM's: 1,050 rpms

 

yup that is whats listed


good link for carb info
http://xjbikes.wikidot.com/carb-specs

 

I think it was a 900 frame with 750 motor

 

could be bad pickup coil 2 & 3 use same pickup

 

Or a lead is unplugged… Gotta narrow things down

 

Correct.