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...

Whilst marking up the inlet port for matching to carb/inlet rubber I noticed the inlet rubber hole is not round. 3/4 of the hole is ok but the 6 oclock to 9 oclock area is quiet deficient in rubber raising the question, has anybody else noticed this? The bother is that it makes it a little...

Looking at Porting the Head on a 650 04 model,on exhaust side looks to be a edge that would help if removed ,little worried about water jacket has any one done this and gone to deep if so how much material can i take off?

ok i'm trying to take the ports right out. running 37mm inlets and running outta space. if you've ported one that far you'll know what i'm running into. please PM me if you can help overcome the obstacles. looking for guidance on: welding as reinforcement guide support ovality (if...

hello chaps well i've mentioned porting the exhaust port and replacing my 27s with 29mm valves. for those that don't bother to read "taff's racing season" (in race reports) i shall just recap by saying that i had a flat spot' lugging off the bottom in second gear from a 'dead corner' but...

Since my engine decided to die on me, I did plan to rebuild it to a higher spec. Firstly, I'm having my cylinder head ported, and I was thinking of fitting an Acropovic exhaust this winter. If I do this, which changes will have to be done on the carb? As the engine breathes better more fuel...

Hi there! Is there a possibility to take out the valve guides without damaging them? I want to polish the Cylinder-head, but have no time to get new guides, as the berg should be back to bussiness next weekend... So i want to take the guides out, polish, and put them back in. Possible...

Does anyone have experience with "porting" the 02, 03 cylinder heads ? I am wondering whether the removal of the valve stem guide inside of the ports has any reduction of valve life ? I have a ported 03 head with the guides completed gone from within the port. Please help.