Duncan racing engine rebuild

[drift king]

has any one had any experience with ducan racing im looking at the national 350 kit minus the exhaust and filter what do u guys think of it? http://duncanracing.com/buyersguide/yamaharaptor350.html

 

[miami1]

damn, wish i had seen this a few months ago

 

[DeadLastRacing]

Looks awfully pricey. you can do all that at a little over half there price if you shop around. And use the rest of that money to upgrade shocks and hat have you.

 

[miami1]

its high but the exhaust and carb alone would make up $700

 

[ratmraptor]

If the price doesn't matter to you go for it. Atleast you know its done right. Plus if you pay full price instead of finding a cheap place you'll know that theres warranty on the parts and the work . Which is better then rushed, cheap work.

 

[ryder133]

Is it Duncan Racing that makes the flywheel for the Warrior flywheel mod?

 

[duneracerweston]

ya but they take to much off for most people

 

[ryder133]

Wait so how does the flywheel mod work? Is there a thread about it?

 

[jasonp]

Yes Duncan does flywheel mod and I have it done on my wheeler. It lets the engine rev a little quicker, while making the engine a little easier to kill at lower speeds and rev's. Makes the engine basically not so big and slow feeling.

 

[ryder133]

If someone had the CWR 460cc Stroker, Should they get the flywheel mod or a heavier one? because its a longer stroke?

 

[87warrior917]

ya but they take to much off for most people

How do they take to much off??:loco: Less rotating weight the better

 

[ryder133]

How do they take to much off??:loco: Less rotating weight the better

Well if you don't have enough rotating weight how does the bike keep running and slow RPMs?

 

[jasonp]

If someone had the CWR 460cc Stroker, Should they get the flywheel mod or a heavier one? because its a longer stroke?

I think if I had to do it I would go with a 446cc stroker as the CWR kit has to much compression for pump gas and to make the engine pump gas safe he uses thicker gaskets.

I like it. I would consider a different engine altogether as I've spent enough to buy a used 450r engine.

 

[beastlywarrior228]

How do they take to much off??:loco: Less rotating weight the better

Not necessarily the motor need some rotating mass or else itll fall on his face on the bottom end

 

[87warrior917]

Well if you don't have enough rotating weight how does the bike keep running and slow RPMs?

True true. The counter balance inside the cases will help

 

[ryder133]

I think if I had to do it I would go with a 446cc stroker as the CWR kit has to much compression for pump gas and to make the engine pump gas safe he uses thicker gaskets.

I like it. I would consider a different engine altogether as I've spent enough to buy a used 450r engine.

Wait so the 446cc and 460cc kits run on pump gas??

 

[beastlywarrior228]

Depends on your piston, i have 2 for my 446

 

[ryder133]

The higher compression one will get you better performance though right? But then what kind of fuel does it use?

 

[jasonp]

Wait so the 446cc and 460cc kits run on pump gas??

They both can. FST is setup to do it piston wise. CWR has to use gaskets to raise the head up to reduce compression.

 

[87warrior917]

The higher compression one will get you better performance though right? But then what kind of fuel does it use?

105-110 octane. Could prob get away with mixing 50/50 with 93 and 110