Ty175 Flywheel Weight

[biffsgasgas]

So I have been told to shave down the ty175 flywheel weight. Then i have been told to remove it. Then told to not touch it. So what has been done out there? 

 

Removal

Shaved

or left alone?

 

--Biff

[feetupfun]

It depends on how much the motor has been hotted-up, and the riding technique and standard of the rider. I have a fairly-well hotted up 205cc motor in one of my TY175s and there is no way I would want to reduce the flywheel weight from standard, but on another TY175 with standard performance motor I think the little bit of lightening it has had has helped it.

There is no one perfect flywheel weight for any motor, because flywheel effect is a trade-off and everyone rides using different technique

 

[goudrons]

The talk is a lighter flywheel allows the motor to spin up quicker as there's less mass for the motor to move and in theory it's correct.

F1 cars have very little weight on the engine so they spin up their rpm very quickly.

 

But the mass of the flywheel keeps the engine spinning at low rpm and will store some of the engines energy.

(which is why you can shut the throttle off before you reach the top of a climb and still make the top or rev up and dump the clutch for a hop)

Again, little weight causes F1 cars not to idle very well so they sit in pit stops with screaming rpms as they won't idle very slowly.

 

So lightening what you have will cause the motor to spin up slightly quicker, not store the same amount of energy for off throttle maneuvers and will stall at slower rpms a lot easier.

 

If you are going to experiment, pick up another flywheel and take small amounts at a time.

[biffsgasgas]

Yea I am very familiar with the purpose of the flywheel and the items that you are pointing out. 

 

So my plan is to install boysens and a pwk24 flatslide. I will mildly port the engine and measure the squish. I don't think i want to remove much. Maybe none at all.

 

FYI most F1 engines have nothing but a clutch in the way of a flywheel. I feel that the ty175 is over weighted however i also love how that lil engine can chug so my head is looking for what that balance is. 

 

--Biff

[spinner]

  Biff I have 3 flywheels that I had been experimenting with, stock about 6.25 lbs a 5 lbs one and one around 4 lbs.   I've have been using the 4 lbs one and will not go back the the others. The bike I rode at the Nebraska National had the light flywheel on it, the bike doesn't stall and idles smooth.I'm still using points with the condensor mounted under the tank ,the cylinder has been ported and the squish is tighter. I should have let you ride it at the national you would have liked it.

 

[biffsgasgas]

  Biff I have 3 flywheels that I had been experimenting with, stock about 6.25 lbs a 5 lbs one and one around 4 lbs.   I've have been using the 4 lbs one and will not go back the the others. The bike I rode at the Nebraska National had the light flywheel on it, the bike doesn't stall and idles smooth.I'm still using points with the condensor mounted under the tank ,the cylinder has been ported and the squish is tighter. I should have let you ride it at the national you would have liked it.

 

That's what I am looking for. Thanks!

 

I have three whole bikes in the house now and I have some room to play with them. Thanks for the info! Next time sir. I will not let you ride off with out me trying

 

 

--Biff

Edited August 27, 2015 by biffsgasgas

[2stroke4stroke]

From where are you removing the metal? Round the circumference

or from the face, it makes a big difference to the effect.

[biffsgasgas]

I would be more inclined to remove from the face. Obviously that affects the moment arm of inertia. I have the weight seperated. I will probably take it to one of the most natural trials riders I have met who quit the sport to build huge pulling trucks. If your ever in Detroit I will show you the shop.

--Biff