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79 GS 550e rebuild

  • Thread starter Thread starter Sand_fiend
  • Start date Start date
Very nice. That's a sweet exhaust. What is it and where did you find it?
 
I had to have the fork tubes and header re chromed because of sever rust. I ported and polished the exhaust and port matched the intake to the boots
 

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Dang. Sure like to find one of those today for my 550 (673). Good looking rebuild. Keep it coming...
 
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so a little more info on this build. i bought this bike new in 79. I had yoshimura build the first motor. a 635 kit with vm 29 smooth bores. a year after i had three gs550e's. sold two over the years but kept this one because it was the first thing i ever bought new. the old yosh motor is long gone but i had a new still in box Wisco 635 Big bore kit. and two motors in parts. i built this motor with the 636 kit. ported and polished the exhaust ports, port matched the intake ports to the Boot size. New valves, valve springs and 10 thou off the head. Mega cycle road/race cam's. New timing chain and guides. i still had the Yoshi exhaust and am installing it on this build. the bike has been stripped to nothing, cleaned, painted or replaced. the tank still needs to be stripped because of cracking in the paint. Im going to stay with the blue but add a Gun metal metallic stripe to the tank and side covers to match the gray rims. I painted everything Blue back in 80.
 
hi looking good, what sort of horse power do you expect when finished ,looks much better with a black frame I think.
 
So it took me 25 years to find out i got taken. I had a set of Mikuni VM smooth bores and a set of mikuni built for my motor that was built by Yoshimura back in 80. the other carbs were a back-up set i never used until i tried to start this bike before i took it apart. the bike ran like crap. it would not idle and seemed to be running on three cylinders. I took them apart to see if they needed a good cleaning again because they have sat for 25 years and the outside looked bad. he said he knew how to mod them to run better. these are mikunis but they are not the ones i gave him. on carb #3 the float blow lag had been broken off and a screw was inserted then drilled to hold the float pin. So what now. i have not see this guy in 20 years.. ok so i check them out good and it seems they will work. they don't leak or overflow. Then i tear them down and find all 4 idle screw washers and O-rings missing. Two carbs have 125 mains, one has a 135 main and the last has a 120 main. What a asshat.. that would explain the rough idle and running like crap i hope. I just ordered new jets, o-ring and gasket kits.

Got the parts in today. After bead blasting the carbs they got a good soaking and cleaning.
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The caliper were powder coated by a friend who has a oven in his garage.. LOL. Brakes have not work like this in years.. new rebuild kits in everything..
 
Well i was going to try and start it up today. I took the petcock off the tank to check it for debris. Inside of the tank is very clean and the screen was spotless. I took the back off of the pump to check the diaphragm and it is as hard as a rock. i have been looking for a new diaphragm but forund nothing that looks close to my petcock. mine has a drain screw on the front side so i don't know if the diaphragms are different from the ones that don't have this drain screw. i ordered on on line from a different petcock that looks the same.. hope it fits..
 
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I guess 28 years toughens up old parts
 

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