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78 gs 1000 drag bike

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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Just bought a 78 gs 1000, I plan on turning this machine into a dragbike.
Does anyone know the max the engine can be bored out. I would appreciate any info,tips from anyone who has done this sort of thing with
this bike. 8)
 
There are a few on here who can help you. Me, I have a standard GS1000
 
depending on what carbs you are planning on using you may want to go to 1980 head, as far as boring it depends on if you are going to bore the cases for oversized cylinders. You have lots of work ahead of you, complete engine rebuild
 
Strip the engine!
Weld the crank-pins, remove the stator/coils and rebalance crank
Check gears/gear selectors for wear & replace if neccesary. Undercut dogs on gears.
Fit an uprated oil-pump.
Fit stainless steel backing plate to clutch & weld rivets
All the above is just insurance work really, none of it will make you go any faster, but it will make the engine more reliable.
Fit the biggest bore kit you can get - 1238cc was the biggest, but needed new liners & the crankcase mouth opening up.
Get the head professionaly ported - or done by someone who knows what he is doing! A CV carb head is desirable. If you can get larger valves, fit them! The power is made in the head - the bigger carbs that you can run makes bigger power, but to do this you need to have a head that is capable of sucking the larger volumes of air/fuel mixture. Don't neglect the exhaust ports - the burnt gases have to get away as well!
Get an extractor type exhaust - the V&H pro-pipe is good
After you have done all the above, and all is working OK, then fit Nitrous - it really is power in a bottle, and if you have got the engine performing well normally aspirated, N2O will make it fly!!
By now you will need a lock-up clutch, the rear tyre won't be big enough......it goes on & on & on............
Before you start, ask yourself how far can you afford to go?!! Because once you start down the slippery slope you don't want to stop!
 
which piston manufacturer sells the1238cc kit.Also does the 4 valve head fit on the 2 valve engine if so would it be more beneficial in any way.
Paul said:
Strip the engine!
Weld the crank-pins, remove the stator/coils and rebalance crank
Check gears/gear selectors for wear & replace if neccesary. Undercut dogs on gears.
Fit an uprated oil-pump.
Fit stainless steel backing plate to clutch & weld rivets
All the above is just insurance work really, none of it will make you go any faster, but it will make the engine more reliable.
Fit the biggest bore kit you can get - 1238cc was the biggest, but needed new liners & the crankcase mouth opening up.
Get the head professionaly ported - or done by someone who knows what he is doing! A CV carb head is desirable. If you can get larger valves, fit them! The power is made in the head - the bigger carbs that you can run makes bigger power, but to do this you need to have a head that is capable of sucking the larger volumes of air/fuel mixture. Don't neglect the exhaust ports - the burnt gases have to get away as well!
Get an extractor type exhaust - the V&H pro-pipe is good
After you have done all the above, and all is working OK, then fit Nitrous - it really is power in a bottle, and if you have got the engine performing well normally aspirated, N2O will make it fly!!
By now you will need a lock-up clutch, the rear tyre won't be big enough......it goes on & on & on............
Before you start, ask yourself how far can you afford to go?!! Because once you start down the slippery slope you don't want to stop!
Click to expand...
 
SqDancerLynn1 said:
depending on what carbs you are planning on using you may want to go to 1980 head, as far as boring it depends on if you are going to bore the cases for oversized cylinders. You have lots of work ahead of you, complete engine rebuild
Click to expand...
What is the difference in the 1980 head. thanks for the response
 
gs1000

gs1000

inlet tracts were larger to fit cv carbs you can use the older head but there is more machining to do ..no the 4 valve head will not fit not alot of benefit anyway
ozman
 
pothole said:
which piston manufacturer sells the1238cc kit.
Click to expand...
Wiseco used to do them for the GS1000, but I don't think they are listed for Suzuki any more. I think they still list Kawasaki GPZ pistons which will fit - check the wrist pin size. I think you need 78mm pistons, but check that, I am going from memory there.
 
One of the best places for dragbike info is...www.dragbike.com
the cheapest way to go racin' is to buy one already "done up" from someone that has gone broke doing it, remember the only way to make small fortune drag racing is to start with a LARGE one.
Go to the local track & check out the local guys and see what the're using.
Depending on what your goals are you need to plan out the entire project before you take the first part off or you will buy something that won't work with the the next part (this will probably happen a few times anyway,I learned this the hard way) and then you have to buy twice,on the bright side of this there are many parts for sale cheap because others are still learning this the hard way.
If you know how fast you want to go you can work from there, if you havn't ever raced go on "tune & test night" with your street bike and practice the "tree"
Remember racing will put stress on stuff(parts) that never broke before and do it at the most inopertune time possable!!
Also there are more links at dragbike .com to S&K racing is a good as well as Brock Davidson Racing, MRE and many more to help you, look at the classifieds pictures plenty of good ideas. Well back to work for me, have fun be safe and don't go top fuel racing before you get the basics down:)
 
78 gs 1000 drag bike

I have raced this bike stock and also raced a 1200 yamaha,so i am familliar with drag racing. Now i would like to jump in a little deeper by
building this bike. About 70% of the bikes i see at the track are of the GS
series so from what i have seen and what the guys there tell me i am off to a great start by choosing this bike. I am also a certified welder and pretty good with wrenches,my brother is a certified mechanic so we are really looking foward to turning this bike from mild to wild.
 
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