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I found different combustion chamber sizes on the older bikes when the hp ratings changed , could very well be they opend them up a bit more or made the ports a little different size , doesn't take a whole lot if done to the right places. A person would need to have one of each head side by side and measure all aspects.
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My 2003 model dynoed 34,6hp on the rear wheel with the snorkel removed, and a new exhausttip, and i think a pipercross airfilter. At that point it had over 50.000km on it, so perhaps the powermods just about made it up for the wear in the engine...
My friends ktm640 dynoed with a 10hp loss from the stated HP at the crank, to the actual meassured rearwheel-hp. If it's the same for the xt600, you would be very close to 45 hp on the crank :D |
True Rear Wheel Horsepower
The SRX is the same engine. Who knows, maybe its all in the exhaust, maybe you got the 44hp when open up with more air and new exhaust. |
Valve shrouding
On my 2001 E , the valves were badly masked by the sides of the combustion chamber even at full lift. I marked around the head gasket and opened the head away from the valves. It made a real difference.
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He means the combustion chamber is closed over somewhat around the outside in a portion of the valves , valves can't "breath" fully. Think roof. The XT's aren't that bad , similar to most . The head gasket need to be shaped so they don't stick into the combustion chamber. My klx650's are horrible and 6-8hp gains can easily be had by going 2mm overbore and grinding the chamber open around the outside of the valves to match the 2mm bigger bore.
I haven't seen any of the newer heads to know if they changed the shape , that could easily loose several hp. |
danimalu if you remove head again you can take a picture.
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Has the 3tb a big valve head ?
Cheers Min |
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