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July 7th, 2017, 03:53 AM   #1
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I Ride: 08 Husaberg FE650, 92 Husaberg FC501, 1991 Honda CR500, 1982 Honda CR480
Thumper Racing Head Porting

Hello,

Since I now have a 08 KTM 505 XC-F to ride I am looking into sending my 08 fe650 head to Thumper Racing to have them do their head mods, most likely Trail Port.

Jesse of Thumper Racing was recommended to me by hillclimb champion (Ret.) Robie Peterson.

Has anyone used them or can they recommend a company in the USA. Thanks!

https://thumperracing.net/index.php?...tegory&path=73
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July 7th, 2017, 08:42 AM   #2
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I Ride: "2000" FE600, 1996 FC600, 1984 Husky WR400, 2015 Beta Xtrainer
I had Thumper Racing trail port the head on an '05 KTM 450 SX that I used to desert race. They installed the 6 speed tranny at the same time and the results were excellent. The power was just as they say, more broad. The engine seemed smoother as well. It didn't lose power anywhere and just worked better.

Generally speaking, they really know their stuff. After the KTM 450, I decided to race a '08 KTM 250SXF and eventually ended up with a Thumper Racing 320 kit installed. I can't remember if there was any head work included but that was probably the best single track race bike I've ever ridden!

I currently am working on building a 1996 vintage Husaberg FC600 engine into a fire-breathing beast using a 100mm piston from a later Husaberg 550. Thumper Racing has done all of the machine work to fit the big piston in what was originally a 95mm bore cylinder. They sourced the oversized sleeve, bored the cylinder, and pressed the sleeve in. They also clued me in to a custom rebuildable rod for this engine. My finances are a bit tight at the moment, otherwise I'd have the engine at their shop getting the crank set up, balanced and final assembly done. I also plan to have them do a trail port with larger valves as well as boring the carb.

Incidentally, the owner's name is Travis. I don't know if he has a "Jesse" working for him but, usually when you deal with Thumper Racing, you deal with Travis. He goes by TravisD37 on KTMtalk.
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July 7th, 2017, 09:34 AM   #3
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I Ride: Husaber FE 400 E 1998, Suzuki DR 350 SE 1998, XT 350 1992
What cc's will you end up with on that setup ?
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July 7th, 2017, 09:40 AM   #4
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With the stock 84mm stroke it'll come to 660cc.
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July 7th, 2017, 01:52 PM   #5
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Originally Posted by thorgan View Post
I had Thumper Racing trail port the head on an '05 KTM 450 SX that I used to desert race. They installed the 6 speed tranny at the same time and the results were excellent. The power was just as they say, more broad. The engine seemed smoother as well. It didn't lose power anywhere and just worked better.

Generally speaking, they really know their stuff. After the KTM 450, I decided to race a '08 KTM 250SXF and eventually ended up with a Thumper Racing 320 kit installed. I can't remember if there was any head work included but that was probably the best single track race bike I've ever ridden!

I currently am working on building a 1996 vintage Husaberg FC600 engine into a fire-breathing beast using a 100mm piston from a later Husaberg 550. Thumper Racing has done all of the machine work to fit the big piston in what was originally a 95mm bore cylinder. They sourced the oversized sleeve, bored the cylinder, and pressed the sleeve in. They also clued me in to a custom rebuildable rod for this engine. My finances are a bit tight at the moment, otherwise I'd have the engine at their shop getting the crank set up, balanced and final assembly done. I also plan to have them do a trail port with larger valves as well as boring the carb.

Incidentally, the owner's name is Travis. I don't know if he has a "Jesse" working for him but, usually when you deal with Thumper Racing, you deal with Travis. He goes by TravisD37 on KTMtalk.
You know what now that I think about it your right. The guy I talked to was named Travis.

Super nice guy and talked to me about Ti valves and KTM cam that they could machine to fit etc.

Glad you had great results!

Thanks for the input!
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July 9th, 2017, 04:10 PM   #6
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I Ride: 2012 ktm 300 xc-w.. Peace out 2011 FE 450, kinda happy seeing you go...
Thumper racing and DJH are where I would send my engine...
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July 10th, 2017, 12:11 AM   #7
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you lot make porting sound so special or secretive. its just mind numbing boring work that is filthy for those of us that have to do it. a day without porting is a good day in the office!

Taffy
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July 10th, 2017, 01:15 AM   #8
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Just like my boring work I went through to fix my bike because you prefer to spend your days in the office claiming the husaberg specialist story ....a day withouth porting is a day withouth buisness ..

Never use thumper racing ( not yet) as they have some nice stuff for rfs/husaberg ...but if you see their profile, they know what they doing
Thanks from tourist and canolman
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July 10th, 2017, 01:47 AM   #9
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There's more to porting than just grinding away. Compare a grind and polish with a head ported by a professional who then tests the results on a flow bench as he goes along. No comparison! It's not just what you remove it's knowing what to leave.
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July 10th, 2017, 03:42 AM   #10
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I Ride: 08 Husaberg FE650, 92 Husaberg FC501, 1991 Honda CR500, 1982 Honda CR480
Originally Posted by canolman View Post
There's more to porting than just grinding away. Compare a grind and polish with a head ported by a professional who then tests the results on a flow bench as he goes along. No comparison! It's not just what you remove it's knowing what to leave.
Canolman is on point with what he said. Flow testing is key!

I just installed the DJH manual cam chain adjuster on my 505 with oil PSI boosting mod to the top end. He too appears to know his stuff.

I actually may send my 505, 501 and 650 head all at once to get re-worked.

Anyone ever made a custom 2 into 1 header for their Berg/KTM? I want to make an equal length one that will compliment the porting.
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