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78550 update, fixes, and new settings

  • Thread starter Thread starter badbrown
  • Start date Start date
B

badbrown

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After struggling with flat spot issues, weak spark, overconsumption of fuel, etc. I went ape and went through the entire bike again and fixed everything again. Now the bike is running better than ever. I guess the first go around fixes were'nt enough so here it is. Intake boots sealed. Airbox boots tight. All negatives cleaned grounded nicely. Replaced corroded connecters on battery, pos and neg. Reconfigured power source to DYNA S. Checked all voltage to coils w less than one volt drop loss from connecters. Reduced aomount of connecters to coils and Dyna. New Ignition swich (key switch) not kill. I opted to do these things instead of the coil mod which I feel is unneccesary at the moment.

So I have a 4-1 exhaust, Airbox with no lid. VM carbs with stock pilot #15. Needle on richest setting, and 102.5 mains. 2 turns out on air screws and float height 24mm(stock). Carbs synced and chop tested (currently).
 
badbrown said:
After struggling with flat spot issues, weak spark, overconsumption of fuel, etc. I went ape and went through the entire bike again and fixed everything again. Now the bike is running better than ever. I guess the first go around fixes were'nt enough so here it is. Intake boots sealed. Airbox boots tight. All negatives cleaned grounded nicely. Replaced corroded connecters on battery, pos and neg. Reconfigured power source to DYNA S. Checked all voltage to coils w less than one volt drop loss from connecters. Reduced aomount of connecters to coils and Dyna. New Ignition swich (key switch) not kill. I opted to do these things instead of the coil mod which I feel is unneccesary at the moment.

So I have a 4-1 exhaust, Airbox with no lid. VM carbs with stock pilot #15. Needle on richest setting, and 102.5 mains. 2 turns out on air screws and float height 24mm(stock). Carbs synced and chop tested (currently).
Click to expand...

102.5 is the stock main jet size, isn't that way too lean with a 4-1 pipe?
 
The stock size on a vm carb 550 is 80. Stock size on a CV carb 550 is 90? 92? I think. Someone replied to me in a old thread, they were using a 100 in their 550. So I got 102.5 for my 78550 vm. And 110 for my 79 cv bike. I used the jet chart on jetsrus.com. I put in the 102.5 today and the bike pulls hard to redline. I figure if the color from the chop testing is right then it is not too lean for the 4-1.
 
badbrown said:
The stock size on a vm carb 550 is 80. Stock size on a CV carb 550 is 90? 92? I think. Someone replied to me in a old thread, they were using a 100 in their 550. So I got 102.5 for my 78550 vm. And 110 for my 79 cv bike. I used the jet chart on jetsrus.com. I put in the 102.5 today and the bike pulls hard to redline. I figure if the color from the chop testing is right then it is not too lean for the 4-1.
Click to expand...

My mistake, I thought it said 78750.
 
I did the relay mod on my 850, BUT I used the relay to power the Fuse panel, turned on the relay by ign switch. Glad that you got it fixed. Sometime it does not pay to take shortcuts...
 
I was about to do the relay mod as well but I figure I don't need it now since I was able to recover the lost voltage to less than 1 volt. I had bought the relay and socket from Radio Shack but I guess i'l save it for another bike.
 
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