So.... Power

[DrDomRob]

Ok, let's all assume we're millionaires for the moment... what can we do to get maximum hp out of our engines?

Obviously the first place to look is big bore kits, but are they legal to use in club racing (I know nothing about the racing scene)? Is there an opportunity to lighten up the engine internals at all? Is it a waste of time?!

Previous discussions about exhaust suggest there is very limited pipes available... Is this an opportunity?!

Dom

[stripes1976]

maximum overbore is +1mm for racing.
so far 76rwhp is the best i've done on std capacity.
the suzuki ttf3 teams were only making 72rwhp but that was between 1990 and 94
biggest restricting factor is the headers
they work well with ram air but you need sp carbs with the pressure balanced float bowls
to reach big figures with the 76a there are a few secrets though.
If you want things done i can do them but it will cost though
i've already had the exhausts made and jigs made up but no one put there money where there mouth was

[DrDomRob]

76 is a pretty big hike over the standard. Well done!

This might sound a bit dumb, what are the headers?!

[CMSMJ1]

headers = pipes

exhaust header pipes

[DrDomRob]

Ok,

That's what I thought, best to check so we're all singing from the same hymn sheet!

Stripes - Sounds like you've been here and done this a thousand times over! What sort of 'things' are we talking about? Or is that private and confidential?

Dom

[Variablevalves suck]

Aside from tuning the motor any racer will tell you that the suspension & tyres on the 4's will return the quickest laptimes per £. Get the supension set up well, you will take seconds off a lap and then look at the motor.

[stripes1976]

Aside from tuning the motor any racer will tell you that the suspension & tyres on the 4's will return the quickest laptimes per £. Get the supension set up well, you will take seconds off a lap and then look at the motor.

spot on! i've said it once i've said it a thousand times. i've seen guys throw loads into motors giving silly hp figures and still come last. tight circuit or road use you want low end grunt. but if your track allows the revs to run free without tight corners when you can maintain your speed ie tt circuits then i would say push the usable powerband to the higher end. and run an sp box with big carbs and wild engine work. i'm not going to go into detail about what i've done cos it where i make my beer money. i'm sure there are aa few of the old members here who will say if they see this.there are 2 types of my headers now but ive not got pics to hand. the biggest gain is the biggest loss. the weight of my complete exhaust engine to end weighs less than the std can. if your wanting good tyres look at the 090 bridgestone. fork oil choice for the sp and std are different aswell. if your wanting bigger gains for power then you will have to be not afraid of using a die grinder.

if you want something done you can always ask me with what your wanting. if it pays to keep my bike improving then i'll do it

[Variablevalves suck]

Hey stripes do you think the SP carbs make a big difference compared to the stock carbs? I run mikuni TMR's on my 73A motor and they make a huge difference but cost mucho. I wonder if Jay sold his FCR's as they would have made somebody very happy. I have a rare book by the man himself 'Yoshi' that takes you through a complete F3 build so im able to tune as per Suzi.

[DrDomRob]

Ok,

That all sounds like good advice, but I have to admit I always thought the standard suspension was fairly good, never had any problems with wallowing in corners, losing lines or even excessive fork dive, although the last time I rode it was close to 3 years ago!

That said, I might not be riding the bike hard enough and when I go on the track and push a bit harder all of these problems may manifest. I've seen before that some guys have changed the shock and front end for K3 600 (I think) rear and Kwaka 636 front end... but I might be getting bits mixed up here. Is it worth doing this or will the standard parts come up nice with a bit of tlc?

I'm all for big gains with small bucks!

As for tyres I was running dunlops, I've now got some part worns on, although I don't know what as it is still being prepped for me by a mate and I haven't actually seen it yet.

Regarding weight loss in general, is there anything that can be ditched/changed ie fairing, bits of cooling system (ie reducing rad size) etc.

Dom

[Variablevalves suck]

Dom, is the bike for track? if so it may be worth posting in the general tech area and get a cross section of ideas as tracking a bike is basicly the same for any make.
Do not put a smaller rad on! if anything you go bigger as the bike spends its life flatout and so gets much hotter than on the road.