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The story.
I am embarked on an epic journey the day I installed a pair of aftermarket pipes (MAC Paipes) on my stock 78 GS550. That opened the pandoras box. Started backfiring and losing power at all throttle positions. So I decided that I needed to rejet my carbs.
Having never done that before, I ordered a set of carb rebuild kits, tore up the carbs, cleaned everything and started to wait for the kit to arrive.
The bike was just sitting there, staring at me demanding more attention, I just couldnt say no. That is when i decided to repaint my bike.
Having never done that earlier, I walked into the nearest sherwin-williams autopaint and started asking questions. The more I asked the more I got confused. So I decided to try the hands on learning technique and bought all the paint stuff.
Harbour Freight is just 2 minutes away from home, I have forgotten how many times i have run to the store. There i bought a 8 gln compressor, $15 mini detail paint gun, and many other things to paint the bike with.
Sanded, Painted, Clear Coated with fair amount of success.Will post that story elsewhere. Oh..I also Kreem lined the tank.
Meanwhile my carb kit arrived. So I rebuilt the carbs. Rejet to 90 Main, and 17.5 pilots. I had no scentific way to guess the size of the jets with out the bike starting so I used a formula I found somewhere which said 3 sizes up the main and 1 size up the pilot for an aftermarket exhaust.
Tried starting the bike, would backfire through the carbs while starting , and through pipes while running.
Tried changing to DYNA S ignition and Coils, thinking that it was an ignition issue. (the stock coils had a bad plug boot). No amount of fiddleling made the bike start or run correctly.
That was when i decided to go EFI.
The electronic engineer in me sure does understand the circuits and it had been a while since I had used my education for something, (I am an IT consultant, dont have much to do with electrical engineering at work).
Found a set of Kawa GPZ1100 Throttle Boddies and injectors on ebay for $150..I hear that they are a perfect match for the GS550. I have also ordered MS1 V2.2 (Microsquirt kit), which I will start building as soon as it arrives.
In the mean time, I am digging around to see what other people have done and get some ideas.
What has me bogged down is how to modify the fuel system to accomodate fuel return...any answers anyone.
I am embarked on an epic journey the day I installed a pair of aftermarket pipes (MAC Paipes) on my stock 78 GS550. That opened the pandoras box. Started backfiring and losing power at all throttle positions. So I decided that I needed to rejet my carbs.
Having never done that before, I ordered a set of carb rebuild kits, tore up the carbs, cleaned everything and started to wait for the kit to arrive.
The bike was just sitting there, staring at me demanding more attention, I just couldnt say no. That is when i decided to repaint my bike.
Having never done that earlier, I walked into the nearest sherwin-williams autopaint and started asking questions. The more I asked the more I got confused. So I decided to try the hands on learning technique and bought all the paint stuff.
Harbour Freight is just 2 minutes away from home, I have forgotten how many times i have run to the store. There i bought a 8 gln compressor, $15 mini detail paint gun, and many other things to paint the bike with.
Sanded, Painted, Clear Coated with fair amount of success.Will post that story elsewhere. Oh..I also Kreem lined the tank.
Meanwhile my carb kit arrived. So I rebuilt the carbs. Rejet to 90 Main, and 17.5 pilots. I had no scentific way to guess the size of the jets with out the bike starting so I used a formula I found somewhere which said 3 sizes up the main and 1 size up the pilot for an aftermarket exhaust.
Tried starting the bike, would backfire through the carbs while starting , and through pipes while running.
Tried changing to DYNA S ignition and Coils, thinking that it was an ignition issue. (the stock coils had a bad plug boot). No amount of fiddleling made the bike start or run correctly.
That was when i decided to go EFI.
The electronic engineer in me sure does understand the circuits and it had been a while since I had used my education for something, (I am an IT consultant, dont have much to do with electrical engineering at work).
Found a set of Kawa GPZ1100 Throttle Boddies and injectors on ebay for $150..I hear that they are a perfect match for the GS550. I have also ordered MS1 V2.2 (Microsquirt kit), which I will start building as soon as it arrives.
In the mean time, I am digging around to see what other people have done and get some ideas.
What has me bogged down is how to modify the fuel system to accomodate fuel return...any answers anyone.
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