Bandit GSF250V engine questions

[raptorsc]

Hope someone can help, bought bike with unassembled engine. Have searched the old site but can't see anything I need to know.

Need to know valve clearances for inlet and exhaust.

Need to know how to time the camshafts in relation to the crank, which marks on cam sprockets line up with what?

Finally, the engine has 2 coils, would like to know which cylinders each coil fires, so if I am sitting on bike which cylinders does the right hand side coil fire?

All help much appreciated

[Red01]

I haven't heard of anyone who has sourced a service manual for a GSF250/250V in English since this was primaily a Japanese Domestic Market (JDM) bike. Some were exported (white market) to some other Asian countries, like Indonesia. Someone was talking about getting the Japanese service and owners manuals translated, but I don't recall anything ever coming of it.

The 250 does share much in common with the 400 of similar model (V or regular) and year (there's a 1st & 2nd Generation of both bikes as well as V and non-V variations). I'm guessing your best bet is to use a 400 manual that covers the 400V... and if you can source a Japanese 250 manual, you maybe be able to figure out if any of the engine rebuilding specs are different by looking and pictures and looking out for numbers.

The left coil fires cyl 1 & 4 and the right coil fires 2 & 3. The left side is determined as you sit on it.

GOOD LUCK!  

[raptorsc]

Hey thanks, that is some progress.

Just gotta figure which colour wire goes to which coil terminal, orange and white wires on left side and I *think* orange and black on right hand side, as sitting on bike

[PitterB4]

The left side is determined as you sit on it.

As is the right!  

The 400 and 250 do share a great deal but I would imagine that the valve clearances are different.  Hopefully someone who knows will chime in for you.  Be patient, we do have a bunch of 250 riders but they sometimes don't check in very frequently.

Good luck!

[raptorsc]

I now have cam timing and valve clearances.

I should get a wiring diagram so that I can connect the coils correctly.

[echomadman]

Would you post the info on the timing and valves, it'd be useful information for the FAQs.

[raptorsc]

Valve Clearance when cold

Inlet: 0.10 - 0.15 mm or .004" - .006"

Exhaust: 0.15 - 0.20mm or .006" - .008"

Cam Timing

With engine at TDC (remove right side crank end cover and line up T mark) on No1 cylinder (left side as sitting on bike) look for the number 1 on the exhaust cam sprocket, 1 must face towards front wheel and be perfectly horizontal to valve cover gasket surface. Import is that the chain is tight between this sprocket and crank sprocket on the front side of engine. Then position the inlet cam sprocket so that the number 2 (stamped in sprocket like No 1 on exhaust sprocket etc) is also paralell to gasket surface and again pointing towards front wheel.

Now on the front cam the number 2 will be pointing vertically up, from the tooth directly above this number count 20 pins in the timing chain at which point you should be directly over the inlet cam sprocket and the number 3 which is vertical, engage chain with 20th pin in sprocket tooth above the number 3. All loose chain is to be between the inlet spocket and the crank ie at the back on the motor. Once all cam journals have been tightened etc then the chain tensioner can be reinstalled once it has be rewound with a screwdriver.

DO NOT RELY ON THIS INFO, I HOLD NO RESPONSIBILITY for the accuracy of this even tho it was taken directly from the manual.

[PitterB4]

Awesome!  Thanks for the info!    Rather than moving this thread, I'll just copy the post above this one into a new thread over in the FAQ.