Like the Phoenix rising from the ashes Two Stroke Motocross is reborn!
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I am very skeptical at this moment about that horsepower result. Really, a 350 making more power than all the 450s? Seems fishy. And I test rode all the 2013 KTM MX bikes and the 350 in no way felt as powerful as the 450, even with the less weight.
I'll wait for the comparison tests to see.
As far as the 250SX goes, I could imagine they can get 55hp out of them by now. If they really cared. But there is no class to push them to have to do that.
There is a point on a MX track where there is too much power. Of course, that depends on the rider and their skill. Then the advantages of weight. As said, many pro 250 riders match the 450 lap times. I would personally probably be quickest on a 200, that is my theory. I can wring a 125/144 out but would like more bottom end. While in the desert, I can use all 55+hp of my 380 at times.
It doesn't make more power than ALL the 4foopties. Remember it needs to be wrung out to get that 53 horsepower. The KX450F makes about 55 at around 10,00 RPM. the 350 is getting pulled by the 450s all the way until the high revs when the 350 just keeps dishing out power.
I still don't trust it until there are back to back dynos. After seeing 450s "jump" a few years ago from ~48hp to ~54hp with no changes to the engines, this could be the same. New dyno, re-calibrated, weather changes, etc.
For a 350 to match a 450 in peak power, it is being stressed to the limit or everything else is being held back.
That was when EFI actually started working decently and a combination of improved engineering. At 48 horsepower, there really is no reason to go with a 450 over a 250smoker. I'd say the manufacturers realized this and put a little more effort into it.
I am very skeptical at this moment about that horsepower result. Really, a 350 making more power than all the 450s? Seems fishy. And I test rode all the 2013 KTM MX bikes and the 350 in no way felt as powerful as the 450, even with the less weight.
I'll wait for the comparison tests to see.
As far as the 250SX goes, I could imagine they can get 55hp out of them by now. If they really cared. But there is no class to push them to have to do that.
There is a point on a MX track where there is too much power. Of course, that depends on the rider and their skill. Then the advantages of weight. As said, many pro 250 riders match the 450 lap times. I would personally probably be quickest on a 200, that is my theory. I can wring a 125/144 out but would like more bottom end. While in the desert, I can use all 55+hp of my 380 at times.
It doesn't make more power than ALL the 4foopties. Remember it needs to be wrung out to get that 53 horsepower. The KX450F makes about 55 at around 10,00 RPM. the 350 is getting pulled by the 450s all the way until the high revs when the 350 just keeps dishing out power.
if your head is as per the stock bore and now your bored out a full 2mm bigger then your cylinder area has increased by 8%. thats a fair margin so should be altered to match the new bore.
While your in there you can get your head modified to the modern shape/squish/volumes also so you can get the most out of the old girl.
So a combination of your head being for a smaller bore bike and it also being a 30 year old design is reason enough for me to recommend that mail the head off to a reputable two stroke tuner to get it set up properly.
This same tuner can most likely also make you an oversized gasket also as a big overlap is definitely a no-no!
either that or buy some copper sheet and make your own head gasket like I do, or simply send your stock gasket to a laser cutter and tell them you want that replicated but with an Xmm diameter hole instead. Will set you back 50-100 bucks so get a few made while your there as all the cost is getting it set up!
Cripes,it even looks like a Lectron.
Red Edmonston invented the Lake Injector, 1968, the Pos A Fuel, 1971, the Lectron, 1973, the EI Blue Magnum, 1977, the Edelbrock Quiksilver in the 80's, the AFT in the 90's and the SmartCarb (our name) in 2001.
Yes, Red Edmonston was my friend and I worked with him the last five years of his life. The SmartCarb is the culmination of his life's work and he was working through the last few hard details when he died. The issues he had with Mike were not pretty and there were a lot of hard feelings over the AFT carburetor (after the Quiksilver) that he and Mike had partnered with. He said he always held back the best and I knew the potential this carburetor had, so I partnered with some people and we bought the technology. Red felt very paranoid about this carburetor and expressed to me how much technology had been stolen from him over the years (most recently PSI) so any detailed information from him was pretty vague. He ultimately died of brain cancer and shortly before he died he hid all his technical writings and drawings which we were never able to receive, so if you can imagine trying to learn 45 years worth of experience with these type of fuel systems was difficult to say the least. Past that, correcting the remaining issues.
What we have now though is absolutely the finest mechanical fuel delivery device ever made and we are just scratching the surface of it's atomization potential.
Best Regards,
Corey
Take your carburettor and find a large deep body of water. Throw said carburettor into that body of water! Fit EFI and don't piss around!
Rings don't help piston rock, and the same person that says that twin rings make the piston run cooler(they do but it's very marginal due to increase in friction as rpm rises) will run 50:1 oil.
Dual ring: Longer lasting, more stable in bore, 2 rings to transfer heat to the cylinder walls so piston stays cooler.
A thing to notice is it governed by bore size and rpm. Bigger bore engines will tend to have 2 rings smaller bore single rings.
I am not getting at any of you guys. If you believe in it go get one.
I have been around long enough to know that just because someone says it's true, doesn't mean it is.
If it works great. But I reserve judgment at this time.
Even though I'm just tuning in now, this has always been my goto response for something that claims a 10% power increase was it?
Come on... That 10% is rather circumstantial don't you think? That would have to be the best case scenario.
Otherwise, I say that until a true Direct Fuel Injection system is brought out, this is a welcome advance. If it works. I'd like to see a more technical explanation of how a carb can automatically adjust for temperature, altitude etc. And I'd DEFINITELY want to see some real to life reviews of it before I go plonking down god-only-knows how many $$ on something that may or may not have the claimed results.
I am not getting at any of you guys. If you believe in it go get one.
I have been around long enough to know that just because someone says it's true, doesn't mean it is.
If it works great. But I reserve judgment at this time.