Hello, everybody. Nice to meet ya. I've been scouring the internet for a good source of info on my 'ol '79 GS425, and this is the only place that seems capable enough to give me any answers. So here it goes.
I've got a GS425 a little while ago, that runs decent. SLOOOOOWWW as heck, and has a mean flat spot at around 3500 rpms. I mean flat.... it barely wants to go over that. Bike's been laid down... slid a while, too... many scrapes on the bike. Stock turn signals had holes in them from scraping. So i'm building a bobber out of it. I already cut the frame, exhaust, took the seat off, etc. so don't talk me out of it. And now i'm wondering- What kind of jetting should I start out with? Nobody else has any info on hand. I have the headers cut just in front of where the mufflers went, and i still have the crossover pipe. Now- if I cut the crossover pipe flush with the exhaust, welded a nut on it, and stuck a big enough bolt in there, I think it would give me enough backpressure to keep the engine happy, and the noise down a bit. What do you think? I'm running cone filters, also.
I've removed the front fender, rear fender, frame past the rear shocks, frame that holds the mufflers / passenger pegs on, mufflers, and the aftermarket seat. I left the plastic inner fender and plastic chain guard on. You wouldn't believe how much that aftermarket seat weighs! I've got a nice cushy harley seat to put on there- boss had it lying around. Am I forgetting anything else I can eliminate? What gas tanks fit this bike?
Well, guess that's it- I'll post some pics as the project is completed. Thanks to all of you in advance.
Adam
Forgot to ask- how do the ports on the head look? would I benefit much from porting them while i'm at it? Might as well get everything done right now, so I don't have to rejet later on...
Thanks again.
a better place to look is www.thegsresources.com they specialize in those older bikes. Someone here still might could help you, but...