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Big valve GS1000 head

  • Thread starter Thread starter Crankenstein
  • Start date Start date
I was in at one of our local speed shops last week and the owner was showing me his CNC porting setup...He brought up, as an example, an inlet port from a head imported from the US which he'd probed and copied...I don't know what it was or who had produced it but the port angles were pretty well identical to the GS1000 setup.I asked if his software had a scaling function. The answer was yes. Hmmm, one day when finance allows...Sure beats hours of peering down a die grinder.
 
greg T - like to hear how it goes,, small port, big valve combination

The answer is - very well indeed. Owner came out to take it up the road for a systems check. I watched as he went over a small bridge and opened it up as he saw the open road...Gave it a handful and it went about a foot sideways, LOL. Only supposed to be a quiet run.
At the track it had all it's lost midrange back plus a better top end.
I'd told him it really needed fresh rubber for the weekend, but no...So while he led several races, all they had to do was wait till he was well sideways and go underneath him.
Rider's comment - I like the usual option of dialling up wheelspin when I need it - not every time I open the throttle.....
FWIW it's running a 160/60 17 Michelin rear. We really need to look at a legal 5 inch rim and go to a 180.
 
that is great - give a guy what he asks for , and then he wants what he used to have lol!

It was self inflicted...When he came back from the test ride up the road, he looked thoughtful and said "it's got a bit of an edge now, hasn't it..."
Which was when I told him it needed rubber....
At the track, there's a series of lefts which tighten slightly as they go on. One of his competitors remarked to me in passing on the Saturday that I should go down and have a look at the GS there as it was spectacular from his viewpoint behind...I wasn't game to go look. Apparently by the last left it was nearly full opposite lock....
 
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