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Depends on the Dyno, air pressure you run in the tyre, elevation temps and a bunch of other stuff if bikes are anything like cars...

Really only useful for same day comparisons although 2 runs on the same Dyno on different days is a useful comparison....

I learnt when I was messing with cars for track that most Dyno's lie.... :)
 
rapidray said:
MOTOMAN that thing Bill & start beating it like a red headed step child! Ray.
Click to expand...

Yeah, Motorman's method is the way to go. Not very PC to treat it like the red head though.:-\\\ Just a normal good old hammering should do the job.

Bill, if you leave it running for 10 minutes at 3000 - 4000 rpm with no load on it, you're wasting the opportunity of getting the initial bedding down process started. As Motorman explains, the window of opportunity for a really good ring sealing surface is pretty narrow.

The ideal run in preparation is to have the spark timing set conservatively, carbs tuned slightly fat and pre-fill the oil galleys and cam bearings by spinning the engine over with the plugs out, just prior to the first start up.
Avoid too rich a setting, or you will wash the cylinder walls and destroy the chance of a good bedding down.

Once started and it feels and sounds right, get out on an open road as soon as possible. No long periods of idling or no load running.

Don't get hung up on HP figures. You'll know soon enough if you're getting the sort of performance you're expecting.
 
49er said:
Bill, what's this Vance & Kerker 4-1? Do you have a hybrid pipe with parts from both makes, or have the two companies recently joined forces?:-\\\
Click to expand...
Kerker pipe with a V&H baffle.
Pretty tight fit!
 
Here is some pics of my plugs. They are 1-4 left to right.
I think #2 has a leak on the vacuum nipple for the petcock since I have it blocked off. I run a pingle.
sparkplugs001.jpg

sparkplugs002.jpg

sparkplugs003.jpg
 
chef1366 said:
Here is some pics of my plugs. They are 1-4 left to right.
I think #2 has a leak on the vacuum nipple for the petcock since I have it blocked off. I run a pingle.
sparkplugs001.jpg

sparkplugs002.jpg

sparkplugs003.jpg
Click to expand...

Plugs looks real good. They have more color now then before.
 
Charlie G said:
Bill,

Why are the threads on your plugs ground/cut to various lengths?

cg
Click to expand...
The only way to read the main jet jetting is the ring at the bottom of the insulator. You can't see it unless you chop the plug.
I sacraficed a few plugs so I don't go BOOM!
The main jetting in this case is perfect.
 
I've read the term "Plug Chops", and I understand reading the color, but I had no idea it was literally a plug chop! That could be tricky to do. Cut the plugs I mean. Read and learn.

cg
 
chef1366 said:
The only way to read the main jet jetting is the ring at the bottom of the insulator. You can't see it unless you chop the plug.
I sacraficed a few plugs so I don't go BOOM!
The main jetting in this case is perfect.
Click to expand...

Plug chops indeed!! Where's ya sense of adventure?

BOOM:p
 
chef1366 said:
Is that a premonition? Or am I missing something?
Click to expand...

No premonition Bill! Those plugs are looking fine. Just a faint ring of carbon at the base, as you would like. The tips are pinker than mine. It's safer that way.

Ya gonna loose a bit of compression when ya fit those plugs back up though.:-\\\
 
OK
Besides a good sync I'm calling this thing done.
Lowered the needle a half notch this morning. Did a valve clearance (four tight ones), oil and filter change. Tried the Rotella 5/40 full synthetic.
32 degrees full advance(double checked just now).
150 main jet 1&4
152.5 main jet 2&3
Pilot jet 50
Jet needle 3.5 from bottom
Has gobs of torque. Roll on wheelies! Whoopie!
 
chef1366 said:
OK
Besides a good sync I'm calling this thing done.
Lowered the needle a half notch this morning. Did a valve clearance (four tight ones), oil and filter change. Tried the Rotella 5/40 full synthetic.
32 degrees full advance(double checked just now).
150 main jet 1&4
152.5 main jet 2&3
Pilot jet 50
Jet needle 3.5 from bottom
Has gobs of torque. Roll on wheelies! Whoopie!
Click to expand...

Sounds good. What cam timing did you settle on?

I tried 5W40 in the 850 a couple of years back. It rattled so much when it was cold, I changed back to 10W40. I'm now sleeping well again.:D
 
49er said:
Sounds good. What cam timing did you settle on?

I tried 5W40 in the 850 a couple of years back. It rattled so much when it was cold, I changed back to 10W40. I'm now sleeping well again.:D
Click to expand...
108/108 on the cam timing.
 
Sync'ed the carbs.
Advanced the timing a little. The plugs weren't showing enough color on the tang.
Having a little trouble with the idle under 1.5k. May be the RPM guage though. It showed an idle alot higher than the old one.
May be fat on the pilot jet with the 50.
 
Gs tachs aren't accurate and tend to read over by at least 50-100 at idle in my experience...
 
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