Flywheel weight?

9 replies to this topic
  • rexbond007

Posted July 07, 2007 - 07:34 AM


I know i have to put a flywheel weight on. but what size to i go with?
i ride tight trails , hill climb, what to you guys suggest?

  • CaptainKnobby

Posted July 07, 2007 - 12:48 PM


I know i have to put a flywheel weight on. but what size to i go with?
i ride tight trails , hill climb, what to you guys suggest?

Go with a 4oz. weight:thumbsup:

  • kxman

Posted July 07, 2007 - 06:35 PM


Go with the complete Yamaha off-road flywheel. It only cost $100

  • yz4fun

Posted July 07, 2007 - 08:41 PM


Just rode my 04 YZ 450 for the first time with the GYT-R off road fww,which is the heavy one.Night&Day difference in power delivery.Don,t worry about power loss because there is,nt none. It still has all the arm yanking power!!!! 100$

  • rexbond007

Posted July 07, 2007 - 08:52 PM


i was told that it would mellow out the bike, but the gain is it it makes it harder to stall in tight stuff. is this true? i don't know the pros and cons to the fly wheel weight.

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  • kxman

Posted July 08, 2007 - 09:26 AM


In theory it should mellow out the bike. If it mellowed out mine I didn't notice. What I did notice is the lack of stalling.

  • flintlock28

Posted July 08, 2007 - 09:33 AM


Yes, the heavier flywheel weight will make the bike less likely to stall, in tight trails, etc. Think of it this way.....the engine is designed for MX where you want a relatively lightweight flywheel, so that the engine will "spool up", that is, the engine will wind up quickly, so that you can come out of a tight corner, and have a quick revving engine to make that jump that's right near the corner.

On trails however, you want a heavier flywheel to keep the engine turning over when it is running at low RPM. The additional weight keeps the engine chugging over, due to inertia.

I ride both track and trails, and I use a dr. D 6 oz. heavier than stock flywheel.

I recommend the Dr. D model because they offer a 4 oz., 6 oz., and a 8 oz. heavier model. If I were you I'd buy the Dr. D model because Dr. D allows you to exchange the flywheel for a different weight if you want to. Let's say you get a 6 oz. and you think it's too light. Just pay the shipping, send them your 6 oz. and they wlil ship you an 8 oz. model. You can exchange the flywheel as many times as you want pretty much, with only paying shipping costs.

Since using my 6 oz. heavier model, the bike gets much better traction, and in the tight, twisty, uphill trails, it pulls like a tractor. Before with the stock flywheel, I'd occasionally stall it...not anymore. As far as acceleration goes, it's pretty much unchanged..maybe a hair slower. If you ride both track and trails, I'd order the 6 oz. model. If you ride trails only, get the 8 oz. one.

  • ThompsonV311

Posted July 08, 2007 - 10:15 AM


This is what you need right here. http://www.thumperta...ct=27045&cat=32
Just posted it yesterday.

  • xrmarty

Posted July 08, 2007 - 10:24 AM


If you REALLY want to eliminate stalling all together, you might want to look into an auto clutch like Rekluse Z-start or Pro. I installed the Pro on my WR and I really like it. The bike almost never stalls, no matter how nasty and technical the trail is.

  • kxman

Posted July 09, 2007 - 04:50 AM


I personally don't recommend the Rekluse. Tried one in my 06 and didn't like it at all. Much prefer the flywheel weight.

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