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Building a cheap dragbike

  • Thread starter Thread starter Anonymous
  • Start date Start date
It's truly an amazing world when three people from Canada, the U.S. and Ireland can be brought together by their common love of motorcycles. Thanks friends!!
Massakins- Great advise. Just a couple of questions.How difficult is it to fit the 850 cylinders and pistons. What exactly is needed? Will the 750 cams work or will I need the 850's? What about cam chain? Valve cover, etc. Also can you tell me the advantage of gs1000 cams? I will take you up on your generous offer if they will help. I remember my last gs1000 owners manual said to use a gs750 intake cam if you wanted to boost power.
Yes, it will have both a rev limiter, a 2-step, switched clutch lever, air shifter, etc.
Lightness is the secret. The frame will be stripped of every unnecessary bracket and accessory, but I am keeping the electric start, not the charging system though. I have friends who race their bikes this way. No problem if you put the battery on the charger for a few minutes every other round.
Any more advise???
Paul
 
Oh, I do have stock cast iron liners and stock pistons for a gs 1000. Can the cylinders be bored and the 1000 liners be pressed in place? That way I could use the 1000 pistons as well.
Paul
 
Skip, there are many examples of nitrous powered bracket bikes running with winning consistency. My thoughts were that "once this combination is dialed and your ready to go faster I'd add nitrous". This description included a slick and wheelie bars, which will add alot of consistency and reduce the chance of wheelspin and wheelies. Very important that the combination is dialed in first.

Secondly, I added that there was "no return on the cost of pricey pistons, porting, cams etc. on the 2v GS750". Not much of a market there. But nitrous parts can be moved from bike to bike regardless of the make and retain some resale value as long as they function and are not obsolete.

The most successful nitrous bikes are using a control box similar to those marketed by Schnitz Racing to program the amount and timing of the power. With these boxes you can launch with a controllable power level and then add it with each gear or based on elapsed time as the bike and rider can best use it. This set up provides incredible power with consistency. Far improved from the old pushbutton with its on/off response. Many ways to skin the cat, these are my ideas.
 
Nasty, I "think" the GS850 pistons use the same wrist pin (17mm) as the GS750; GS1000 uses bigger (18mm). GS850 kit should be a direct swap.
No need to change cylinder head so cams are only an issue if there is performance to be gained. I'd measure lift and go with the highest lift; duration makes a difference but is pretty much the same on OEM cams. Stock cam chain, valve cover, etc. is fine, too. GS1000 cams have about .324" lift, ie when peak lobe measurement is subtracted from measurement perpendicular to it.

Lightness is key when looking for performance. If its not on the bike it won't break. Plus it doesn't have to be accelerated, leaving more power for the remainder. I saved 40 lbs removing the on-board starter and all of its associated equipment from my GS1000. If I could have kickstarted it I would have. Good luck.
 
massakins,
Sorry..... I stand corrected. My nitrous system is from the dark ages with almost no electronics at all.(except for the fuel pump and solinoids)
Technology Has come quite far since then I guess. Plus because I was not running wheelie bars and had a stock tire the bike was a real handful under nitrous (not for thr faint of heart) and not that consistent.(but exciting as all hell!) Thanks for your input on the subject..........................skip
 
Alright, I'll go with the 850 cylinders and pistons. Can anyone help me out with these parts? In Canada if possible.
Thanks, Paul
 
I saved 40 lbs removing the on-board starter and all of its associated equipment from my GS1000. If I could have kickstarted it I would have. Good luck.

The 79' 850 had a kickstart option.
 
massakins said:
I saved 40 lbs removing the on-board starter and all of its associated equipment from my GS1000. If I could have kickstarted it I would have. Good luck.
Click to expand...

The 79' 850 had a kickstart
 
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