billyt

Yes, albeit home made. I tried the guys bike and it was WEIRD....... to say the least.

What do lefties do with a right hand throttle? Do they just adapt? Do they switch the throttle over to the left hand side? I there any top world or national rider who is a leftie?

How about Green for the Bhoys. Couldn't ride an Orange bike.

How about guys putting lots of grease on a bolt and then trying torque it. Torque specs are based on dry metal to metal contact unless called out for a specific anti seize or lubricant. If so the torque value has to be reduced from the dry value.

I once heard you could use any piston from any bike. Water cooled vs air cooled don't matter, a piston is a piston is a piston.

This has alway been an issue. Motorcycle piston clearance vs American V8.Typical Honda water cooled piston clearance is .0004 to .0015" new, service limit .002"Have a cyclinder bored by a machine shop not use to those numbers it come back at .003 or .004". Already well past the service limit or more than twice the spec.Typical air cooled Honda runs. .0004 to .0017" with service limit of .004"Example 1986-1995 XR250 R .0006 to .002" service limit .004"Wonder why some engines have piston slap cold ...........start with .005 or more for clearance.:eek1

I suspect freddy is pretty close. For example Porsche specs their 90mm (3.5433") piston to bore clearance at approx 0.003". This is on a precision engine that can survive on a racetrack off the showroom floor, it is also an air cooled cast aluminum cylinder with a coating and a forged aluminum piston both of high quality alloy content. Running a cast iron cylinder with an aluminum piston will definately need more clearance and it also depends on whether or not it's air or watercooled as the aircooled run a little hotter and tend to warmup faster. I remember my old stroker Ford Windsor, with street mufflers on you could hear the piston slap for a few moments til the pistons expanded.Lose is like a worn engine an might smoke a little, too tight and the piston seizes or badly damages the bore, you decide. http://bbs.homeshopmachinist.net//wink.gif------------------

SUPERMOTORookie Member Joined: Oct 2, 1999 Messages: 5 Likes Received: 0 #2SuperMoto, Feb 27, 2006

Like many of you on this site I have been around the trials scene for over thirty years now. Heard many urban myths, street lore, snake oil, and some basic nonsense about mechanics of trials bikes, their engines, carbs and suspension. In your opinion what are some of these myths and lore that are off the wall? Love to hear your experiences on this topic.

What is the altitude of your riding area?

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I actually asked the same question of LS of why Maxima 0-10W ? I would agree the Mobil 1 ATF is a good substitute.

Yes I have. ATF oil does not has similar charicteristics in the way of shear, foaming, stiction. Amongst other things an automatic transmission uses hydraulic pressure through its passages. Two completely different applications.

Because they sell Maxima......

How did you come up with a hypothesis that a synthetic fluid engineered for a hydrualic application (automatic transmission) is the same as a synthetic fluid engineered for a gearbox with clutch application?

Your fuel and oil is the common between your two problems. Hmmmmm.....

I agree with Lineaway here. Two bikes out of XXX all over the world hardly constitutes "Major Production Issue !!!!!

Here you go right out the owners manual.

There is a one way reed valve in the crankcase. Simple but affective.

Food for thought....... Orifice of jet constant. Adding more oil to the pre mix. There is a point where adding so much oil the mix will go lean (due to the more oil displacing the gas molecules to get through a given orifice). Although the oil mix ratio has went rich the burn mix has went lean. Go figure this paradox... ask your self what is more flammable a full gas can or an empty gas can? Trials oil gas mixing ratios of the majority of riders are no where near the controversial tipping point of too much oil making the mixture go lean. We are taking about below 20:1 ratios. Oil in the gas has several jobs to do, depending upon engine design, oil the main bearings, lube the con rod, lube the piston to wall, help stop blow by. If there is a CO sensor in the Vertigo exhaust then maybe it is sensitive to carbon build up hence cutting back the oil ratio to help the CO sensor stability longevity???

"For anyone who is interested pistons are pistons they are not made specifically for an aircooled engine or a watercooled engine as in there are no differences in thermal expansion rates between the two" You mean all these water-cooled bikes are a waste of time? Why did the engine design engineers go to all that bother? Are you telling me that an air cooled engine does not lose power once it gets really warm? Are you saying that the consistency of an air cooled bikes power output was never held to the same laws of physics? While the expansion rates of a particular type of aluminum that the piston is made of may be the same (an air cooled piston vs. a water cooled piston, aluminum is aluminum, ) the environment that that piston performs in i.e. a water cooled cylinder vs. an air cooled cylinder is two different environments. In an air cooled engine due to the poor heat dissipation i.e. fins, the piston and cylinder expansion was greater and exposed the bike to a power out put drop, pinging and a seizing of the engine, hence why there was a greater gap. A water cooled bike can hold the temperatures in a more controlled environment. Basically the two piston materials may expand and contract at the same rate in theory it is the environment that is the concern fins vs. a water cooled jacket. Can I please have the name of this well know engine builder plater so as I can avoid them.....

Moulder had written in his first post "However I'm not sure if a water cooled piston can be used in an air cooled engine?" I am advising to be careful with that thought...

Trying to use a water called engine piston in a air called engine is risky thing to do. Why? The clearance on a air cooled piston to cylinder is much larger to allow expansion of the pistons during running. The whole idea of a water called engine is that the pistons and cylinder stay cooler and affording smaller clearances of piston to cylinder. A piston of a water cooled engine would be tighter and could expand very easily seizing up the engine.