I bought my 05 1.5 years ago, rode it 3 times and it started getting hard to start. I assumed it was bad intake valves but the PO told me it had only 8hrs on new valves. I moved, started a family etc and it sat for the last 1.5 years. I finally pulled the head today and the left side intake valve is rusty and I can see a pinhole. The PO ported the head himself and obviously got a little thin on the water port/intake runner. The pinhole is about 3/8-1/2" up from the valve seat. Is this area usually thin and prone for cutting through? I'm trying to decide if it's weldable or do I buy an OEM 07-08 head to replace it. Valves are good, only about 8hrs on them. Do most mx machine shops like MX Time do tig welding?