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Not specific to your bike but I use this method (Reply 2)
Aircooled RD Tech Help 250cc and Above / Re: RD400C Brake help!
« Last post by mervin on Today at 06:20:34 PM »
Take a bloody great syringe and a pipe and back bleed it from the caliper up to the  master cylinder, leave the top loosely on the mater cylinder when you do it to let the air out but not allow splashes to get out  as the fluid come up, then bleed down normally , if its still a little bit spongey the lever / cable tie trick should work then   
Aircooled RD Tech Help 250cc and Above / Re: simple things!!
« Last post by stukey on Today at 06:15:09 PM »
It is not a problem if parts are replicated the same as original i just wonder why they are not. Surely it costs the same to do it right rather than wrong. The thing is, something that simple would have had me stripping carbs and checking all sorts of things and probably would never have thought of it :-\
Aircooled RD Tech Help 250cc and Above / RD400C Brake help!
« Last post by AimlessMoto on Today at 05:56:42 PM »
Quick and dirty.

1- Running an e-bay front MC. Stainless braided line. Brand-new reproduction caliper.
2- Primed the MC. Bled the line to the caliper banjo.
3- Bled as normal. Made little to no headway... lever went back to the bars, didn't build much pressure.
4- Removed caliper and pads, inserted the plastic guppy that came with the caliper and pumped the BAJEZUS out of the brakes until the pistons clamped the plastic guppy.
5- Cracked the bleed screw and pushed the pistons back into the calipers, then closed the bleed screw.
6- Re-installed everything, went pumping away, built pressure but could still pull back to the bars. Brakes activated and de-activated as normal, slight drag.
7- Re-bled the bleeder. Minimal bubbles.
8- Pumped the lever 10 times, and cracked the upper banjo on the MC. Did this 5 or 6 times, lever firmed up slightly.

Now I have the following:
1- No air escaping the caliper bleeder.
2- Lever that is spongy at best and can be pulled all the way back to the bars.
3- No air escaping the tiny hole in the bottom of the MC reservoir.

I just left the bike over-night with the lever zip-tied to the handle and no change.

Is there something I missed, or are we thinking it's a compatibility issue with the MC? I believe it's a 14 or 15mm MC, same as stock I believe. It was sold as a direct RD400 replacement and had decent reviews.

Any help is welcome!
I'm having a issue with my ycs1 piston 180cc twin dropping a cylinder at idle after warm up.

I have synced my carbs for off idle to be even but I'm wondering if there is a trick to sync them for idle. Or do I have another issue.
Aircooled RD Tech Help 250cc and Above / Re: simple things!!
« Last post by Motty on Today at 05:50:44 PM »
you would be completely buggered

I'm not sure I want to be completely buggered  :o  :D :D
Aircooled RD Tech Help 250cc and Above / Re: simple things!!
« Last post by mervin on Today at 04:36:20 PM »
Trouble is these parts gwet replicated by people in china and India thanks to good old Jonny Krause , and they tend to be a bit variable in quality , especially the rubber bits , and if they are NLA from yamaha then it is good that someone has replicated them even if they need a bit of tweaking , or else you would be completely buggered
If you use a modern cdi or electronic ignition then you should use ideally both resistor plug and cap, if using older points systems then resistor
caps and plugs are not ideal as they do take a very small amount of power from the spark. The resistors are for electrical noise suppression.
You use to know on older TV sets when someone went by without suppressed caps as it interfered with the picture. No doubt this has been covered previously.
My wifes DT125E is the electric start model, and uses the same system as the RD200, as does the GT185. Like I said, I have had no problems with either. I have heard of people who have had problems with Motobats not lasting, but mine have been fine.
Can we change your mind Peter? you know you love the Isle of Wight. The pies at the Wight Mouse are lovely and we all know you like pies.....

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