Thumper racing 520

[nuttyn01]

My hours are getting up there on my 12 FE KTM 450. I was looking at throwing in a fresh piston and came across Thumper Racing's BB option for the KTM 450.

It looks like big gains in the bottom and mid with 6 to 8 hp on the top. Does anyone have any experience with this motor?

 

[M5-]

I have one. I used it for snowbiking for half a season until it blew up. It does fill in the bottom end power nicely which I love on the dirt where you don't need to rev the bike as much as on the snow. For me it didn't work out, on the positive side Travis was a good guy to deal with and treated me fairly on my second rebuild. Now I just use the bike for dirt only. Some guys have had better luck than me with theirs.

M5

 

[Cpt.Ron]

Thumper

We have had very good success with the Thumper Products, big bores included.
Cheers

 

[Manson456]

I have one. I used it for snowbiking for half a season until it blew up. It does fill in the bottom end power nicely which I love on the dirt where you don't need to rev the bike as much as on the snow. For me it didn't work out, on the positive side Travis was a good guy to deal with and treated me fairly on my second rebuild. Now I just use the bike for dirt only. Some guys have had better luck than me with theirs.

M5

What year is your bike that blew up? I thought I read somewhere it was the rod that let go. I see different rod part numbers for the newer than 2012 450's (2013-2015). Trying to figure out if the newer stuff is any better than the older. Anyone know?

 

[DenverSnowBike]

I have one. I used it for snowbiking for half a season until it blew up. It does fill in the bottom end power nicely which I love on the dirt where you don't need to rev the bike as much as on the snow. For me it didn't work out, on the positive side Travis was a good guy to deal with and treated me fairly on my second rebuild. Now I just use the bike for dirt only. Some guys have had better luck than me with theirs.

M5

Did your bottom go?

 

[M5-]

Piston end of a brand new KTM con rod, same as my buddy.

M5

 

[Manson456]

Piston end of a brand new KTM con rod, same as my buddy.

M5

What year of bike?