 Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
Adjunct
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OP
Adjunct
Joined: Mar 2005
Posts: 370 |
Here is my setup so far...
2003 Speedmaster
Air injection removed
Air box removed
TOR pipes
K&N pods
Jets=150
2 1/2 turns out on air mixture screws
Symptoms
Sluggish on take off
Mid range is good
Top range is a bit sluggish.
Suggestions Appreciated.
2003 Red and Black Speedy. What do I want to change on my bike next????
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Re: Some mods done....advice needed to tweak setup
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
Joined: May 2007
Posts: 5,068 Likes: 1 |
Did you up the pilots? That will give you some better off the throttle snap. Stock is 42's maybe try 45's. They are cheap.
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Re: Some mods done....advice needed to tweak setup
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
Are the carbs synced and also 150 jets sound slightly big to me, is that where the jet calculator took you? Also, what needles are you using, any shims? Tors, stock, de-baffled. Provide to us the finer details and one of our Gurus will get you closer to air/fuel Nirvana.
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Re: Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
Adjunct
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OP
Adjunct
Joined: Mar 2005
Posts: 370 |
TOR's are stock
Pilot jets are stock
stock needles with no shims
Carbs have not been synced.
Calculater says 149 on the jets....i had 150's laying around.
2003 Red and Black Speedy. What do I want to change on my bike next????
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Re: Some mods done....advice needed to tweak setup
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Joined: Aug 2009
Posts: 1,669
Learned Hand
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Learned Hand
Joined: Aug 2009
Posts: 1,669 |
Any popping on decel? Any vaccum leaks? Maybe another 1/4 turn out? Just thinking out loud.
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Re: Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
Adjunct
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OP
Adjunct
Joined: Mar 2005
Posts: 370 |
No popping on decel....does backfire when turning it off sometimes.
Will try another turn out and maybe pilot jets
2003 Red and Black Speedy. What do I want to change on my bike next????
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Re: Some mods done....advice needed to tweak setup
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Joined: Aug 2009
Posts: 1,669
Learned Hand
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Learned Hand
Joined: Aug 2009
Posts: 1,669 |
Backfire as in comeing back thru the carbs? Or do you mean ignition of unspent fuel in the exhaust?
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Re: Some mods done....advice needed to tweak setup
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
Quote:
TOR's are stock
Pilot jets are stock
stock needles with no shims
Carbs have not been synced.
Calculater says 149 on the jets....i had 150's laying around.
Our carbs are tuned and regulated by throttle position, never RPM. So, you need an assessment of off idle, 1/4 Throttle, 1/2 Thrtl. 3/4 Thrtl. and full wide open. Also, you will prob. need to use 4th gear, but at full Wide Open, if you reduce to 7/8ths Thrtl. Pos. does the Rpm gain, stay the same or slow down. I personally have had the best tune with Thruxton needles w/no shims, although others find happiness with TBS, stock, stock with shims, every bike seems to be a rule onto itself to a limited degree. It is also advised to make changes one at a time, so you can get a better feel if you going in the right or wrong direction. Bottom line, If an ignorant old fart like me can tune a CVK from just reading the input of other members on here, I'm sure you can too.  Oh and consider investing in a carb. sync. tool, the results are definitely worth it.
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Re: Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
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OP
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Joined: Mar 2005
Posts: 370 |
Seems to be ingintion of unspent fuel in the exhaust...
2003 Red and Black Speedy. What do I want to change on my bike next????
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Re: Some mods done....advice needed to tweak setup
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Joined: Aug 2009
Posts: 1,669
Learned Hand
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Learned Hand
Joined: Aug 2009
Posts: 1,669 |
I'm thinking you might be running a bit rich(unspent fuel) but I'm not sure. I do agree with Ryk and suggest you balance the carbs. You can get a decent manometer fairly cheap or make one like I did using some clear tubing, a yard stick and some 2 cyl oil. Also is the TPS still connected?
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Re: Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
Adjunct
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OP
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Joined: Mar 2005
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TPS is still connected....
Just unplug it?
2003 Red and Black Speedy. What do I want to change on my bike next????
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Re: Some mods done....advice needed to tweak setup
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Joined: Aug 2009
Posts: 1,669
Learned Hand
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Learned Hand
Joined: Aug 2009
Posts: 1,669 |
yep, its a triangular connection, kinda a PITA to get off but do-able. I'm not sure if it will make a difference or not in you situation. Most people have disconnected it when dealing with popping issues on decel. I was just curious.
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Re: Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
Adjunct
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OP
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Posts: 370 |
Thanks for advice....Ill try a few things and post the results.
2003 Red and Black Speedy. What do I want to change on my bike next????
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Re: Some mods done....advice needed to tweak setup
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Joined: Aug 2009
Posts: 1,669
Learned Hand
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Learned Hand
Joined: Aug 2009
Posts: 1,669 |
Remember ONE thing at a time!
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Re: Some mods done....advice needed to tweak setup
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Joined: Jul 2011
Posts: 2,212
Oil Expert
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Oil Expert
Joined: Jul 2011
Posts: 2,212 |
Hmmm, i would not take the TPS off, just the AI and a propper tune and you should be fine.
2007 Speedmaster and miss it!
2013 T-Bird Storm and Luvin it!
Catching a yellow jacket in your shirt at 70 mph can double your vocabulary
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Re: Some mods done....advice needed to tweak setup
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
Quote:
Hmmm, i would not take the TPS off, just the AI and a propper tune and you should be fine.
The man was advised to unplug not remove the TPS to deal with backfiring. You can not remove the actual TPS unless you make a plug to replace (like I did) or I believe LowBrow sells a machined/o ringed cap to actually remove and seal the sensor hole. You can always just plug it back in if that does not help stop the popping.
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Re: Some mods done....advice needed to tweak setup
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
There is a huge difference between chuffing/spitting/farting through the carbs (generally a sign of a lean mixture), and LOUD CANNON-TYPE BANG detonation/explosion in the exhaust (generally a sign of a rich mixture).
Knowing which of the above you have is the first step in resolving it.
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Re: Some mods done....advice needed to tweak setup
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Joined: Mar 2005
Posts: 370
Adjunct
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OP
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Posts: 370 |
Its probably more of a chuffing/spitting/farting sound. It is not a loud detonation....
2003 Red and Black Speedy. What do I want to change on my bike next????
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