plug reading question for doc....
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
RE: plug reading question for doc....
You can set that when the document is is being viewed.....it will show 200% 150% 100% 75% 50% and so on...just make the % smaller and the whole document will show. It's on the right hand bottom of the page on my computer...ZOOM %
Sorry 11
Sorry 11
Thread Starter
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Road Master
Joined: Jan 2006
Posts: 1,221
Likes: 40
From: Chester NY
RE: plug reading question for doc....
Hey doc.....just an update. Been playing with the idle mixtrure screw for a little while now. Had it at 2.5 turns out and were medium loudness with a pretty regular pattern. Tried to turn out to 3,3.5 and almost 4 and all the popping got double loud and random . I tried going in to 1 turn and it was basically the same as 2 or 2.5 turn out. With it any more in than 1 turn, it would barley idle.
Now as some one else said to try, lowering the idle to about 900-925ish. Tried that for a short time and not help either, even with still adjusting the screw in and out...
Tried to advance and retard timing with my DTT. no luck.....
double, triple and quadruple checked for intake leaks or exhaust leaks and nothing....I gues that leads me to the reversion theory. Is that something you can explain to me or is it something that can be tuned out?
I have access to a 5 gas(?) analizer at a local auto shop but the probe is not very long(18 inches or so). Would that be helpfull in fine tuning my bike? Just curious as i rode over 1k miles this weekends, trying everything and my only other though was a pipe change????
Also time for a main jet change as doing full throttle runs at 3/4 throttle had better pulling than full throttle...
Now as some one else said to try, lowering the idle to about 900-925ish. Tried that for a short time and not help either, even with still adjusting the screw in and out...
Tried to advance and retard timing with my DTT. no luck.....
double, triple and quadruple checked for intake leaks or exhaust leaks and nothing....I gues that leads me to the reversion theory. Is that something you can explain to me or is it something that can be tuned out?
I have access to a 5 gas(?) analizer at a local auto shop but the probe is not very long(18 inches or so). Would that be helpfull in fine tuning my bike? Just curious as i rode over 1k miles this weekends, trying everything and my only other though was a pipe change????
Also time for a main jet change as doing full throttle runs at 3/4 throttle had better pulling than full throttle...
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
RE: plug reading question for doc....
https://www.hdforums.com/m_1635545/tm.htm Here is the thread, look through it till you see the three attachments I posted.
Good luck
Good luck
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
RE: plug reading question for doc....
Ok refresh me on your pipes, pilot jet and needle setting. You are correct to change the main jet if you have more power pulling at 3/4 throttle than WOT.
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
RE: plug reading question for doc....
Wow...that pipe shouldn't be giving you any trouble. First off if your power is falling off at WOT you need to go to a bigger main jet which would be the 230. The 48 pilot should be good enough so now my question is what is your elevation, what cams are you running.
Your running the next to the richest needle and I'm thinking it might be too much fuel in mid range. If you go up a size in the main the mid range will get richer too because the main jet feeds the needle jet. Give me the info I requested on your build and altitude and lets get this decel popping solved for you.
Your running the next to the richest needle and I'm thinking it might be too much fuel in mid range. If you go up a size in the main the mid range will get richer too because the main jet feeds the needle jet. Give me the info I requested on your build and altitude and lets get this decel popping solved for you.
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Thread Starter
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Road Master
Joined: Jan 2006
Posts: 1,221
Likes: 40
From: Chester NY
RE: plug reading question for doc....
Doc, i really apreciate the help....Thanks!!!!!!!!
The rest of the info is:
elevation from seal level to about 1000ft...thats what it said online for my county anyway...
37g cams strait up, no advance.....
streetported heads, stock size valves...
98 ci kit....9.7 compression....cv44 with se backplate
You think going back to stock needle and 230 main might help?
The rest of the info is:
elevation from seal level to about 1000ft...thats what it said online for my county anyway...
37g cams strait up, no advance.....
streetported heads, stock size valves...
98 ci kit....9.7 compression....cv44 with se backplate
You think going back to stock needle and 230 main might help?
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
RE: plug reading question for doc....
Your very welcome....
Without a dyno it's very hard to know just what you really need but lets try the 'L' needle with a 230 main jet. See how it pulls at WOT....it should pull all the way to full open without power falling off. If the power does fall off install a 240 and run it again. I'm thinking your too rich in the mid range (again this is a guess with out a dyno to see for sure) which will load up you pipe with unburned fuel giving you the decell poping.
Get the main jet set first then we will get the needle right, the pilot should be just fine. Set theidle mixture screw at 2 turns out for now.
Without a dyno it's very hard to know just what you really need but lets try the 'L' needle with a 230 main jet. See how it pulls at WOT....it should pull all the way to full open without power falling off. If the power does fall off install a 240 and run it again. I'm thinking your too rich in the mid range (again this is a guess with out a dyno to see for sure) which will load up you pipe with unburned fuel giving you the decell poping.
Get the main jet set first then we will get the needle right, the pilot should be just fine. Set theidle mixture screw at 2 turns out for now.