More horses needed

[fzrtim]

Finally got my fzr 4/6 to run with no clutch problems and managed to see what the motor is doing. As the engine is a completely standard 95 fz600r motor (bar k&n filter and race pipes) i have decided to have a little bit of fettling done over the winter period to find a few more horses.

Can anyone recommend a tuner to carry out gas flow ect, or does anyone know the most effective route to maximise power gain without comprimising reliability.

Cheers Tim

[Evilchicken0]

hey Tim whatsuuuuuuuup

Cubes matey. Vs money.

I reckon any of the usual suspects for tuning although I'd probably favour Holeshot out of blind predudice. But basically head gas flowing and a big bore kit, I think they're about 660cc. However this will cost some bucks.

Try looking for a Steel Frame 600 racing site, they'll use the foxeye engine. There was the guy who was looking at using the FZR600 crank and big bore in this engine to get a 720, I know it's been done but don't know how much it cost.

[crasher76]

Back in the 90's PB tuned a CBR6 and FZR foxey (Hargreeves and ??) the Sonex painted FZR was big bored with a TTS kit, smoked like a beast and wasn't a good mod for that particular engine. Search ebay for some old PB mags and you should get an idea of what was involved.

[fzrtim]

Back in the 90's PB tuned a CBR6 and FZR foxey (Hargreeves and ??) the Sonex painted FZR was big bored with a TTS kit, smoked like a beast and wasn't a good mod for that particular engine. Search ebay for some old PB mags and you should get an idea of what was involved.

Yes i remember the feature well. It was Mark Forsythes CBR and it was faster than the FZR as i remember. Holeshot do a bigbore kit but it costs a lot of cash.

Just want to squeeze a bit more power out the engine without making it unreliable. Thinking of having the head gas flowed, race cams ect. Also if i mate the 600r top end to the older fzr motor, the longer stroke of the earlier motor will increase cc to 660 giving a lot more midrange torque.

[johnnymack63]

Yes i remember the feature well. It was Mark Forsythes CBR and it was faster than the FZR as i remember.

My mate bought that CBR of Mark Forsyth. Fuckin' brilliant bike untill I rode it into the front of a Mondeo really fast (daft american on the wrong side of the road). It was shit after that mainly becasue it was in about a million pieces.

Mark at M&M Motorcycles is well into engine tuning (mainly R1's). Having met the fella a few times, I suspect he's forgotten more about making Yamaha's go really fast than I'll ever know.

He's also a regular on this very forum.

Well worth a call if you ask me. I've got his number if you want to PM me for it.