Are you sure you have a 1985 manual you speak of above?.
The 86-87 gsxr400 is the same as the impulse but the motor on the 85 is a lot different.
Have a full manual here.
Great bikes and a lot of fun on track.
Raced a 87 gsxr400 in cams for 4 years and then sold it.
Still going strong last I heard lol.
winding up stucky since ages ago
I have a PDF manual that claims to be the 85. The carbs and brake system are the same. I was just meaning that those 2 systems are the same on the 85 model. As for the engine yes it looks different. Thanks for the heads up about the engine. So can I use engine parts from the 86, 87 gsxr 400 models for the impulse?
So since found a manual for the Tokyo Tower and ordered brake seals front an rear. Scrubbed brakes clean.
Agreed, Though the outer dust seals can get distorted or worn and cause issues. Do spend time carefully cleaning out the grooves they sit in.
I bought a kit for the same brakes as they were too far gone. Still not good enough. Master cylinder swap brought them back to life instantly.
Don't you look at my accountant.
He's the only one I've got.
Sheesh, Greg, whatda yathink? This little 400 is a pig to start.
Thought I'd found a good reason when all the valves were tight as.
Replaced a couple of plug caps which had gone silly. Dyna coils and std copper wire.
But it just takes ages to start. Will fire and die repeat. Don't dare touch the throttle. Starts best with little or no choke. More choke forget it.
Owner says all her 400s were dreadful to start. But I can't give it back like this. It's unusable.
When it's finally hot it seems to start and run fine.
Took it for a ride and screams along.
Adjusted the idle mixture to reduce a lean lag off closed. But tried several settings and starting is just as dire. Choke plungers seem home.
Don't you look at my accountant.
He's the only one I've got.
Well, funnily enough, I have a 250 GJ72A here at present with I assume the same twin choke carbs ?
Got them stripped out and will be picking up some carb cleaner tomorrow.
The idle mixture screws should be pulled - incl the springs, washers and O rings - and that passage cleaned.
Lack of O rings there can cause a lean idle too.
Float height ? vacuum leaks - particularly the hose to the tap ?
Check the air gap ignition trigger/pickup. Close them up to around .010 - .012 thou. As they age they get less sensitive.
Bit like me really....
Yeah I built 1 set of carbs from 3. Twin choke. As the designer should be. Diaphragms working.
Vacuum plugged as gravity on gsxr. Floats unadjustable, Seemed undamaged plastic.
But I never pulled the idle mixture screws. I'll check. Thank you.
Presumably the air gap of the pick up coil is hard to check if attached, I assume, to the side cover and acting on a crank mounted flywheel?
Don't you look at my accountant.
He's the only one I've got.
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