Neil, goodonya !!!! A fantastic effort. Lots of hard work, commitment, passion, distractions and it goes.
I've never seen an engine run so smoothly at 30k
Neil, goodonya !!!! A fantastic effort. Lots of hard work, commitment, passion, distractions and it goes.
I've never seen an engine run so smoothly at 30k
"Success is the ability to go from one failure to another with no loss of enthusiasm.”
Yes it is good to have the sleeve engine running but it's almost worthless without putting real load on. At least it passed the first test and actualy ran without seizing up straight away. I NEED another YZ250 gearbox.
The 3D inlet manifold didn't happen, I just made one in the workshop, but I'll keep trying as the one I made is not quite right anyway but it did it's job. Results like this are dangerous as it just encourages me
Where did I put that FOS cylinder?
Fantastic, (even though I've just switched on and haven't watched the video yet) but to have something like this running without seizing must be a great feeling - it's definitely a unique machine and all your own work too! - deserves all those hand claps you've been getting.
So here's a couple more!
Update,
Just watched it and perhaps significantly, there was no smoke! - (unusual for most first startups) a very good result, well done!
But you must admit that it was inspired by "Harry" ........... (Harry Ricardo).
Well done, a worthy tribute!
Well, I had the privilege to see and hear the engine in person. This is the longest and the most revs it has done to date. I am super impressed.
Here is the video my son took.
https://www.youtube.com/watch?v=P9Mu...ature=youtu.be
My artistic picture, looking through the exhaust at BDC approx.
Thanks Neil
Fantastic stuff (well I shouldn't say fantastic, cos it's real).
If (the other) Neil can't get a suitable box then he'll have to hitch it up to a generator or something in order to wring it's neck! - of course I realize that small steps are probably necessary in the case of this project. - Great achievement so far!
What revs are the pipes going to be tuned to Neil?
Have you seen the Hydroformed thread?
http://www.kiwibiker.co.nz/forums/sh...-exhaust-pipes
I will have a google look on the net for a box and see if the 450 box is similar enough to work with the parts fiche
Alas that's my only talent.
Yeah I know, but Yamaha is likely lazy and unlikely to design two different gearbox's for the two strokes vs the fours. Honda didn't.
looks like its doable. For a man of your many talents.
They made and sold a lot of 450's and I doubt they run long enough to wear the trannies.
here are all the dimensions.
According to the tooth counts in the Yamaha parts diagrams, The 2006-2009 YZ450F share all gear ratios with the 2003-2012 YZ250.
Tooth counts for both 2T and 4T YZs are:
1st) 14:27
2nd) 15:23
3rd) 18:23
4th) 22:24
5th) 21:20
http://www.thumpertalk.com/topic/927...-close-ratios/
of course its easier to go with the YZ as that's what you are set up for but its just an idea the clutch hub is diferent and it looks like the YZ450 has a few wider gears and modified dogs.
I started trolling Ebay today for a Bottom end of a YZ250 but got distracted by work but I couldn't find a cheap one, what do you need other than the cluster and shift drum and forks Neil?
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