FINALLY, 6 months later

[mully95]

Take some pictures of the head and post them if you don't mind. I love looking at mod ****.

 

[Claviger]

Shot of the parking at work today:
Triumph, Triumph, Aprilla, Ducati, Indian.

Such a beautiful thing to see a random collection of bikes with not a single HD or big four bike!

 

[Neville Lush]

Did you break one already ?

 

[Claviger]

Not me, no. Triumph master tech installed the head, checked valve lifts consistent with cam card, hand turned engine no issues. Started the bike and with 20 seconds cylinder #1 pistons met both exhaust valves (but only those two valves) chaos ensued. No one accepting blame, naturally. Same tech rebuilt my entire Transmission, which operates flawlessly, Better than new.

At least I didn't get stuck with the repair bills, dealer forked over the cost to fix the head and I think Carp gave them a discount, not sure, but it's exactly why I'm apprehensive about doing cam timing on a DOHC interference motor, if a Hinkley trained tech can have this happen, I know I could lol.

 

[Neville Lush]

I did not mean you personally, should have said have you had one break already..... There is normally heaps of room , but we all can make errors.

 

[warp9.9]

Not me, no. Triumph master tech installed the head, checked valve lifts consistent with cam card, hand turned engine no issues. Started the bike and with 20 seconds cylinder #1 pistons met both exhaust valves (but only those two valves) chaos ensued. No one accepting blame, naturally. Same tech rebuilt my entire Transmission, which operates flawlessly, Better than new.

At least I didn't get stuck with the repair bills, dealer forked over the cost to fix the head and I think Carp gave them a discount, not sure, but it's exactly why I'm apprehensive about doing cam timing on a DOHC interference motor, if a Hinkley trained tech can have this happen, I know I could lol.

I have a couple guesses here. Over tension on the chain breaking the guide. Slopp in chain jumped timing and crash pistons and valves. Or did not increase the torque on the cam gear bolts gears shifted in the cam gear slots timing out same crash.

Just guessing here not making any allegations

 

[IMFASTTOO]

Not me, no. Triumph master tech installed the head, checked valve lifts consistent with cam card, hand turned engine no issues. Started the bike and with 20 seconds cylinder #1 pistons met both exhaust valves (but only those two valves) chaos ensued. No one accepting blame, naturally. Same tech rebuilt my entire Transmission, which operates flawlessly, Better than new.

At least I didn't get stuck with the repair bills, dealer forked over the cost to fix the head and I think Carp gave them a discount, not sure, but it's exactly why I'm apprehensive about doing cam timing on a DOHC interference motor, if a Hinkley trained tech can have this happen, I know I could lol.

IT does seem to be a problem for some of the dealers and owners who for some reason think they are going to save a little money and do the first hot rod engine build themselves we had one dealer did it wrong 3 times and then sent the bike to the shop for CARPENTER to sort it out

 

[Claviger]

I have a couple guesses here. Over tension on the chain breaking the guide. Slopp in chain jumped timing and crash pistons and valves. Or did not increase the torque on the cam gear bolts gears shifted in the cam gear slots timing out same crash.

Just guessing here not making any allegations

Yeah, there are a lot of potential causes. Based on talking with both Bob and my tech, plus my own inspection of the head, I do have a pretty good idea of what caused it. I guess we'll see, if it works this time, I'll be able to confirm it and isolate who's blunder it was.

The tech isn't a typical "hired off the street and sent to school tech". Hes older, the most senior tech in the state, works on all makes, all models, and has many years of building multi cylinder race bikes, at an independent shop before the track closed here in HI.

No animosity towards anyone on my part, **** happens, errors happen etc. If the problem is what I suspect it was, someone will be buying me a new head though...or going to court lol.

 

[warp9.9]

Yeah, there are a lot of potential causes. Based on talking with both Bob and my tech, plus my own inspection of the head, I do have a pretty good idea of what caused it. I guess we'll see, if it works this time, I'll be able to confirm it and isolate who's blunder it was.

The tech isn't a typical "hired off the street and sent to school tech". Hes older, the most senior tech in the state, works on all makes, all models, and has many years of building multi cylinder race bikes, at an independent shop before the track closed here in HI.

No animosity towards anyone on my part, **** happens, errors happen etc. If the problem is what I suspect it was, someone will be buying me a new head though...or going to court lol.

When I did mine I used the torx bolts on the cam gears. I know triumph changed to allen head but the torx has a larger surface contact in the slotted gears. I normally hate the buggers but felt better about them here. Thats back when we figured out they needed a heavier torque setting.

 

[leatal]

When I did mine I used the torx bolts on the cam gears. I know triumph changed to allen head but the torx has a larger surface contact in the slotted gears. I normally hate the buggers but felt better about them here. Thats back when we figured out they needed a heavier torque setting.

Do you pick up that much more HP by dialing in the cams? I would think using the OEM cam gears would get you very close to a dialed cam gear plus have the security of not having the gear slip and dropping a valve or two.