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› Carb tuning and Jetting at 885 feet.
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Carb tuning and Jetting at 885 feet. (Read 147 times)
teggy
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Carb tuning and Jetting at 885 feet.
01/26/13 at 17:48:20
Looking for a good starting point for jetting and tuning. Mods are Dyna pipe and K&N cone filter. Previous owner melted down engine and I don't want to have same results with new overhaul.
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Gyrobob
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Re: Carb tuning and Jetting at 885 feet.
Reply #1 -
01/26/13 at 18:22:39
What does melted down mean?
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Re: Carb tuning and Jetting at 885 feet.
Reply #2 -
01/26/13 at 18:42:24
teggy,
I am about the same elevation and have a Dyna and a K&N drop in for the stock air box. I kept the stock 52.5 pilot jet, installed a 150 main and used three washers. I have the idle mixture screw at about 1.5 turns. The bike runs great with just the right amount of gurgle in the exhaust on shifts. No loud pops running or at shut fown. With that said, it has not been over 60 degrees since I made the changes.
For what it is worth
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teggy
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Re: Carb tuning and Jetting at 885 feet.
Reply #3 -
01/26/13 at 19:19:43
Thanks I will start there
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teggy
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Re: Carb tuning and Jetting at 885 feet.
Reply #4 -
01/26/13 at 19:21:54
Gyrobob wrote
on 01/26/13 at 18:22:39:
What does melted down mean?
So hot it cooked the cam, head and piston.
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teggy
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Re: Carb tuning and Jetting at 885 feet.
Reply #5 -
01/26/13 at 19:22:47
Piston
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teggy
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Re: Carb tuning and Jetting at 885 feet.
Reply #6 -
01/26/13 at 19:23:45
exhaust
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rat907
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Re: Carb tuning and Jetting at 885 feet.
Reply #7 -
01/26/13 at 20:58:05
Judging by that piston, I'm sure the cylinder has seen better days too. The scuffing to say the least is severe.
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Denny
2005 Suzuki S40 Boulevard, Lancers VM 36 Carb Kit & Thrush Glass Pack... Zoom Zoom!
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Dave
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Re: Carb tuning and Jetting at 885 feet.
Reply #8 -
01/27/13 at 05:14:21
I live at an elevation between 500 and 800, and I did a bunch of jetting trials with a oxygen sensor gauge installed. My jetting ended up real similar to ZAR's, however I had a slight hesitation just as you roll on the throttle. I backe the Pilot down to a 50 and took one of the the 3 washers out of the needle (left 2), and it now runs great.
I had a DYNA muffler and the stock air filter.
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«
Last Edit: 01/27/13 at 18:12:50 by Dave
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engineer
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Re: Carb tuning and Jetting at 885 feet.
Reply #9 -
01/27/13 at 05:53:29
Looks like your engine had a lubrication problem, I doubt that jetting did all that damage but there are many on this forum who have more experience with these engines.
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rat907
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Re: Carb tuning and Jetting at 885 feet.
Reply #10 -
01/28/13 at 04:08:06
engineer wrote
on 01/27/13 at 05:53:29:
Looks like your engine had a lubrication problem, I doubt that jetting did all that damage but there are many on this forum who have more experience with these engines.
Lubrication is a problem with excessive heat. Oil will break down and not do its job even if its super slick stuff. The old Castrol commercials about thermal break down are spot on.
A guy with a Harley was running too lean and his pistons ended up looking like an acetalene torch was used on them. Luckily he didn't seize the motor, but his oil failed also trashing the cam, pistons, jugs and burned the chrome off the pipes near the cylinders.
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Denny
2005 Suzuki S40 Boulevard, Lancers VM 36 Carb Kit & Thrush Glass Pack... Zoom Zoom!
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teggy
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Re: Carb tuning and Jetting at 885 feet.
Reply #11 -
01/28/13 at 06:13:06
rat907 wrote
on 01/28/13 at 04:08:06:
engineer wrote
on 01/27/13 at 05:53:29:
Looks like your engine had a lubrication problem, I doubt that jetting did all that damage but there are many on this forum who have more experience with these engines.
Lubrication is a problem with excessive heat. Oil will break down and not do its job even if its super slick stuff. The old Castrol commercials about thermal break down are spot on.
A guy with a Harley was running too lean and his pistons ended up looking like an acetalene torch was used on them. Luckily he didn't seize the motor, but his oil failed also trashing the cam, pistons, jugs and burned the chrome off the pipes near the cylinders.
I agree.
I believe the bike was used as a commuter bike and was rode hard as well as neglected. Oil changes???? Who knows by the look of it thermal breake down was spot on in this case. No sludge though.
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