Bucket Racer/Crasher
First off it was only .1mm runout, a quick whack with the hammer sorted that out. I'm surprised how flexible it is. It takes no effort at all with the crowbar to spread the crank webs and a tap with the hammer to close them back up.
When I say sorted I mean it is now .3mm and just changes from being out one way to being out another way, grrrrrr.
Anorak
it's so satisfying that something as precise as a well trued crankshaft can be achieved with what is a blunt unrefined instrument. (The Hammer)Originally Posted by speedpro
Kinky is using a feather. Perverted is using the whole chicken
No8 Wire Extraordinaire
That's what happened to my RGV150 crank last time (I paid someone to do it), had to get it redone & welded so it would stay put, but the end of the road so when the crank lost plating on SE it was throw away sort of stuff.
Don't you look at my accountant.
He's the only one I've got.
Bucket Racer/Crasher
I'm probably going to get a good design pipe for a kart track MB100. 192deg exhaust port, 127deg transfers, 12,000rpm. Currently thinking of getting 3 lazer cut or more if someone else wants one. Don't know the price yet but of course it will vary with quantity. I'm going to supply all the bits like a machined mounting flange and machined stinger nozzles as well. I don't mind making them complete fitted to the bike but that is a lot of work so could get expensive or could just roll them up and let the purchaser fit them together. .8mm mild steel. My current mounting flange is fabricated from 1.? mild steel and is nice and light and a real good fit but I'm thinking a machined one from alloy might be as good and flasher. PM me expressions of interest.
Anorak
Have you looking seriously into a MB100 Disk conversion Mike, perhaps with a sleeved NSR top end?
Kinky is using a feather. Perverted is using the whole chicken
No8 Wire Extraordinaire
Why would he? He's currently making class leading power with a great spread. Further, on a kart track a reed valve engine has to be an advantage. Disc valve engines come on real strong.
Wow that is low ex timing & 32.5 deg blowdown. Aiming for the monster grunt machine.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
hasn't finished a race (yet)...
Forum whore
As it has finished plenty of races, you should have said "It didn't finished that race ...".
Forum whore
Fair call mateAs it has finished plenty of races, you should have said "It didn't finished that race ...".
Bucket Racer/Crasher
That particular cylinder has something I've been working on that seems to work so I'm really looking forward to getting it run in and a good pipe on it. The blowdown T/A looks real good. If it works it'll be made public. Definitely looking at a kart track type of motor but still hoping for mid 20s.
Anorak
Why because he currently has class leading hp that's why. He has class leading HP because he always tries to improve number 6.
I asked if he has considered it as he seemed more than a little excited when he saw the pics of the Disk valved MB motor.
The nsr top end has a power valve which would be just the ticket for smoothing out the abrupt power delivery wouldn't you think.
Frits's post's seems to point toward,s an extra 3 or so HP with no loss in power spread compared to a Full crankcase reed.
Oh yeah with regards to Kart tracks how many meeting that count are run on them now.
Wow the number are not what i would have expected for 12000rpm peak either.
Kinky is using a feather. Perverted is using the whole chicken
No8 Wire Extraordinaire
well, . . .no, I don't think the PV is relevent.
I've ridden some fast disc valve engines, but not that many I admit. But one characteristic I didn't like of all the ones I've ridden was the way they come on power. Not that they may be peaky (bear in mind I race an extreme 50), but turn the throttle & BaaaBUUHH. Maybe they aren't all like that, but a reed engine is usually easy to make smooth on the power, which matters 10x more on a kart track than a long track.
Mike seems to be making a Kart track engine. My H was built for Kart tracks & had a hard hit type power (supercross I was aiming for), but it was very controlable in the throttle response transition. that is more what I am talking about than power curve. The MB & H have slightly different exh mounting incedentally, but I have altered an MB pipe to an H before.
Don't you look at my accountant.
He's the only one I've got.
Anorak
Yeah really you are a little in the Flat earth society territory there Dave, really, a non believer in PV's
I don't know if they are all like that either but, I have noticed the same thing but they seem accelerate briskly as well though when upright i always assumed it was a carburation thing? Maybe you get used to it. Personally i found it disconcerting.
The H has the studs on a 45 and the MB is straight in line is that what you mean Dave? are there other differences with the mounting's?
Last edited by husaberg; 1st May 2012 at 20:11. Reason: Added list of successful GP bikes without PV
Kinky is using a feather. Perverted is using the whole chicken
No8 Wire Extraordinaire
Yeah really you are a little in the Flat earth society territory there Dave, really, a non believer in PV's
I never said I was a non believer in PVs, nothing like it. I have converted my CPI barreled RZ from Pressure PVs to Wobblies YPVS actuated ones. My dirtbikes have all had PVs.
So exactly my point. GPs are held on long tracks. Kart tracks are a different beast.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
Heaps of power across a wide range of rpm seam's to work nice for both
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