[guzzi4v]

Dyna Fat Bob. 103", SE204s, SE A/C, TTS, Mild headwork (standard valves), matched TB, Supermeg, Wiseco flat tops 9:6, 175 ccp.

The bike is in Aus, I am o/s. The shop just finished building and tuning the bike. Chart just sent to me. I have not ridden the bike (I know I'll get flamed on that one). The chart looks a bit odd to me. The numbers aren't too bad and I am not so concerned about that. The lines just look a bit odd; it starts out so strong and peaks strongly at about 3300 then really falls away. I think the bike would ride well but there's a little voice in my head annoying me.

I have not seen another chart like it, but then I haven't seen a lot and I'm no expert. I really would like opinons and the questions I should be asking (if any). (I can't get a SAE chart; I hope some of the people from the other forum I tried to post on are over here as well).

 

[HAWGZILLA]

I wouldn't be happy with that printout. Something is wrong. First, the a/f is a bit lean early in the run---not consistant throughout the run.
I would suspect that the clutch may be slipping or that there may be a sumping issue.
Was anything dome to the clutch? If not, it will at least need a stiffer spring to handle the extra torque.
Check it for sumping-- an easy check that will eliminate that possiblity.

 

[BVBOB]

I wouldn't be happy with that printout. Something is wrong. First, the a/f is a bit lean early in the run---not consistant throughout the run.
I would suspect that the clutch may be slipping or that there may be a sumping issue.
Was anything dome to the clutch? If not, it will at least need a stiffer spring to handle the extra torque.
Check it for sumping-- an easy check that will eliminate that possiblity.

Looks like a graph of a sumping motor to me as well.

 

[guzzi4v]

Hawgzilla, BVBOB Thanks; this is the reason why I posted.
I was thinking exactly the same thing in terms of the clutch. I included an heavy duty diaphram spring in the parts I gave the shop. I'll check to see it's installed. I tried to do my homework on what clutch slippage looks like on a dyno chart but I couldn't get what I wanted

Given the fact that this bloke has installed the cams twice because the first outcome was even worse; I believe sumping is a very real possibility. I have already lined up another bloke to look at it (he's Harley trained from the States by the way). I think you see now where my real problem lies. This thread is by way of being as knowledgeable as I can about the situation.

Thanks. When you're not an expert it's good to get some informed opinions.