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Has anyone gotten the motolana swingarm and installed it on a RD400 yet? Anyone have any pics or info on the install ?
Thanks

I dont think HVC offers the rear master cylinder any longer. I dont see it on their site anymore.

What is everyone using for a replacement rear master cylinder for the 400s. Are there any replacements available or one from another model that can be modified. I tried a rebuild kit but the casting is pitted and it is leaking.
Thanks

I think I may have found my issue i swapped the main nozzle jet over from carb to carb and it followed to the other side. I just ordered 2 new ones and am having them overnighted.

Everything has been cleaned and wire thru passages I can get to.all new mikuni jets. I didnt set fuel height just the float height but I have swapped floats between the carbs with no difference. Is it ever common to run larger jets in one carb? I didnt replace the main nozzle that the main jet threads into but they look to be ok.
Thanks

I swapped carbs side to side and it followed the carb. So definitely a carb issue not sure which carb now if one is lean or the other is rich. I have had them apart several times soaking in carb cleaner and new mikuni jets. Drilled the brass balls out and plugged with set screws a couple threads. Going to go back thru them again. 

Yeah brass balls are drilled out and air jets cleaned and tapped and plugged off with 5mm set screw in a couple threads.
If one ring was stuck on a piston would it cause that side to run lean or rich?
Starting to think maybe something other than carb or air leak

Yeah everything looks good that I have checked so far. Starting to think about looking more into the left side to see if something is making it rich.

Yes had exhaust off and baffles out cleaned all the holes had new packing in and tried taking packing back out also with no difference

Yes I meant the right carb cleaned again. All new mikuni jets. Float height is set to spec. New points and condenser from economy cycle. Swapped coils side to side. Even when starting and letting it warm up the right cylinder runs about 25-30 degrees hotter than the left.Checking with IR gun. Anything I else to check electrically points are set at 2.0 mm
Thanks

Leak down start at 6 psi and loose about 1 psi in about 45 min
I have checked timing several times. Cleaning the left carb again now

Yes the needle clip is moved down one position raising the needle. Carbs have been apart several times and soaked in cleaner. Seems to be lean at all throttle positions. I feel like it is an air leak but leak down test looks good. Timing is same both sides.

1976 RD 400 My right cylinder is running lean. I have done a leak down test that looks good. Swapped coils from side to side. It is stock except for UNI foam filter and boyeseen power reeds. I currently have 140 main in left carb with needle in middle position and a 145 Main in the right Carb with needle moved down one position. Compression test shows about 2-3 psi difference in cylinders. And temp check with IR gun shows about 25 degrees hotter on right cylinder also. Any ideas on something else to check for I am running out of ideas. Bike runs good just lean on right cylinder.
Thank.

I can not get it seal with ngk crush washers but I took a crush washer off of a autolite plug I had in the garage its a little different style and it seals with it

I took the crush washer off and made a gasket out of gasket material and it seals with the paper gasket material