billyt

Heard this false statement so many times " The piston going down draws the air/fuel charge in and once compressed as the piston moves up the spark plug sets of the explosion" AGGGHHH It is not an explosion it is a control burn.....

How many of us have said this?

E mail me at. Williamtraynor@hotmail.com. I have similar issue wth some good results. Billy

Trapezartist Got my info from University of Glasgow mechanical engineering classes. Shady dubious source I guess!!! Who knew........ From www.antiseize.com General Information on Torque Specifications..... The amount of torque applied to a bolt or nut determines the Clamp Load. This Clamp Load is a determining factor in the performance of the assembly. The torque applied to a fastener with an antiseize compound pre- applied to the threads will ensure uniformity through out the process but will increase the Clamp Load compared to an unlubricated bolt. For critical applications, as determined by the Engineering Project, either the recommended torque or a torque that is unique to the application shall be clearly identified and specified on the engineering documentation. Standard manufacturing practices for the installation and tightening of fasteners shall apply to all fasteners which do not have a specific requirement identified on the documentation. The following factors shall be considered when applying torque: cleanliness of the fastener, use of a thread sealant or lubricant, degree of lubrication on the fastener, presence of a prevailing torque feature, hardness of the surface underneath the fastener's head, or similar condition which affects the installation. As noted on available charts, torque values should be reduced by 25% for lubricated fasteners to achieve the similar stress as a dry fastener. Torque values may also have to be reduced when the fastener is threaded into aluminum or brass. The specific torque value should be determined based on the aluminum or brass material strength, fastener size, length of thread engagement, etc. The standard method of verifying torque shall be performed by marking a line on the fastener (head or nut) and mating part then backing off the fastener 1/4 turn. Measure the torque required to tighten the fastener until the lines match up. Reduce the torque values by 25% for lubricated fasteners. Torque may have to be reduced when installing fastener into threaded aluminum or brass. The specific torque value should be determined based on fastener size, the aluminum or brass material strength, length of thread engagement, etc. • The nominal torque values listed for Grade 5 & 8 fasteners are based on 75%, of the minimum proof load specified. • Hole size, material strength, material thickness & finish must be considered when determining specific torque. Values: Most torque values are based on non-lubricated fasteners. Definitions: Lubricated means coated with a lubricant such as engine oil, thread sealant or threadlocker. It is necessary to determine Torque coefficient (or Nut Factor) independently, for all critical applications. 2345 N. 17th AVE. • FRANKLIN PARK, IL 60131– 3432 • 847-455-2300 • FAX 847-455-2371 Email: sales@antiseize.com • Website: www.antiseize.com

Good one.......

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.