GS425 new guy

[one_fast_ls1]

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

[one_fast_ls1]

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.

[arbakken]

a better place to look is www.thegsresources.com  they specialize in those older bikes. Someone here still might could help you, but...