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5.000rpm break up?

  • Thread starter Thread starter SAN
  • Start date Start date
S

SAN

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Hello, I have A 1981 GS550T 9.000miles, StageIII.K&Ncones.carbs rebuilt&cleaned. I started having a problem above 5grand, acts like i hit rev limiter .resynched carbs no better then i did coil relay mod. new wires&boots.needle 4th from top.155mains middle 2 . 150m outer 2 cyl. plugs look slight lean. wires and boots improved throttle. as did relay mod. but still breaks up any gear. W-O-T pulls untill exactly 5grand. Did relay mod , had 9.8v both coils. runs great other wise. bowls are full fuel. new petcock. this did not do it last year when i did dynojet/pods. or didit happen when i first took out, this spring. I AM NUTS,tank like new inside,plenty of power to batt,.also 4in 1 MAC pipe steel baffle. put onlast year also. thanks for your time. any ideas welcome! SANView attachment 4628
 
5.ooorpm break up

5.ooorpm break up

HI thats the only thing i can think of.since i did coil mod today. now to find one to try it. before buy it. Thanks SAN
 
I had same thing on my 801000G. That's prob the reference Chef is making as he rode it & did some diagnosis on it too.....

I switched out the ignitor for a Dyna S. I also had a coil going bad. I tested the ignitor using the manual tests & it failed.....

Dyna S is $120 from Z1. You have the mechanical advance like me I believe so it's pretty much a doddle to fit.

Dan :)
 
Great looking T.:)

Dyna S for ND ignition is the one to get.
 
5.000rpm breaking up

5.000rpm breaking up

Well it seems minds of the wise are in agreement. how do you test the igniter. Thank you for the info guys, Enjoy the ride.SAN
 
Involved putting a 1.5V battery across a couple of the contacts from memory.... Should be in the Clymer manual, that's where I got it from.
 
5.000rpm breaks up

5.000rpm breaks up

Well the one good thing is the coil mod has made a big inprovement, to the overall running of bike(exept my up rpm prob) never started better idles smoooth. Also looking at my igniter its not ND. Kokusan denki BB1204 12V, i now 2 types were used Nippon&Koku . Is one better than other, not that it really matters now.Thanks for your help. SAN
 
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