Decel popping - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 25 (permalink) Old 04-10-2012, 10:34 PM Thread Starter
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Question Decel popping

Hey gang...as of late I have noticed a LOT of decel popping...way more than in months past. I hear it a lot on decel between 4k - 6k....so I am curious

Could my PCIII be going out ?
Could I have gotten bad gas ?
Can my bike be burning rich
I have check my tail pipe and I do not see any "rich burning" residue

Upon reflection, it does seem like I am getting less mileage than before....

I plan to have the bike tuned at the same time they install the airbox, so should I wait and see ? Or is this a common/quick fix issue ?

Thoughts...suggestions...dirty rhymes ?

2001 SP1 - Code Name F-Bomb - PCIII USB / D&D High Mount System / 42T / EK SRX 530X / CRG Levers / K&N Filters / Stomp Grip / Rev Limiter Mod / Flapper Mod / PAIR Mod / Undertail / Hugger / 6K HID Lights / Speigler lines / Wave Rotors / CF Airbox / Shorai Battery - More to come, as soon as my slush fund get's more "Slushy" !
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post #2 of 25 (permalink) Old 04-10-2012, 10:57 PM
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Exhaust popping on deceleration is usually from a too lean condition.
If it just started getting worse, and no tuning/remapping changes have been made, then check if you have leaks at your mid-pipe gasket junctions.
The exhaust could be sucking in added outside air, causing a very lean state inside the pipe that's igniting residual fuel vapors.
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post #3 of 25 (permalink) Old 04-10-2012, 11:27 PM Thread Starter
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Thanks Sub....forgive my ignorance on this one. Where are the gaskets that you are refering to ? I have my pipes thermal tape wrapped so I want to make sure I unwrap the correct end...well, i guess I'd be better off just completely un-wrapping both and checking.

I assume using soapy water would show a leak ? or does that only work for tires that are leaking ?

2001 SP1 - Code Name F-Bomb - PCIII USB / D&D High Mount System / 42T / EK SRX 530X / CRG Levers / K&N Filters / Stomp Grip / Rev Limiter Mod / Flapper Mod / PAIR Mod / Undertail / Hugger / 6K HID Lights / Speigler lines / Wave Rotors / CF Airbox / Shorai Battery - More to come, as soon as my slush fund get's more "Slushy" !
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post #4 of 25 (permalink) Old 04-10-2012, 11:34 PM
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Originally Posted by raleighp View Post
Thanks Sub....forgive my ignorance on this one. Where are the gaskets that you are refering to ? I have my pipes thermal tape wrapped so I want to make sure I unwrap the correct end...well, i guess I'd be better off just completely un-wrapping both and checking.

I assume using soapy water would show a leak ? or does that only work for tires that are leaking ?
Your signature indicates a D&D high mount slip on system, so I'd start with where the slip on is secured to the OEM collector as shown in the OEM exhaust diagram.

http://www.mrcycles.com/fiche_sectio...2002&fveh=3621

The suspect parts are the items: 4, 5, and 6. With 6 being the gasket and 4 & 5 being the clamps.
It's not uncommon for vibration and heat to degrade the gaskets or loosen the clamps.
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post #5 of 25 (permalink) Old 04-10-2012, 11:46 PM Thread Starter
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Thanks sub...I really appreciate all of your help. If that is the case, I wonder if that is why I am smelling "gas" from the right side of my bike. I bet that clamp is loose or there is a leak and I am getting a gas "vapor' smell.....I will check it out and let you know

2001 SP1 - Code Name F-Bomb - PCIII USB / D&D High Mount System / 42T / EK SRX 530X / CRG Levers / K&N Filters / Stomp Grip / Rev Limiter Mod / Flapper Mod / PAIR Mod / Undertail / Hugger / 6K HID Lights / Speigler lines / Wave Rotors / CF Airbox / Shorai Battery - More to come, as soon as my slush fund get's more "Slushy" !
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post #6 of 25 (permalink) Old 04-10-2012, 11:56 PM
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Check the nuts where the exhaust mounts to the head too....I know mine have loosened before,



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post #7 of 25 (permalink) Old 04-11-2012, 10:34 AM Thread Starter
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Check the nuts where the exhaust mounts to the head too....I know mine have loosened before,
Let me guess Mad....I say "Check what nuts?"...and you fire back Deez nuts....ha ha very funny...

Good suggestions from both you and Sub. Will spend a bit of time checking this weekend !

2001 SP1 - Code Name F-Bomb - PCIII USB / D&D High Mount System / 42T / EK SRX 530X / CRG Levers / K&N Filters / Stomp Grip / Rev Limiter Mod / Flapper Mod / PAIR Mod / Undertail / Hugger / 6K HID Lights / Speigler lines / Wave Rotors / CF Airbox / Shorai Battery - More to come, as soon as my slush fund get's more "Slushy" !
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post #8 of 25 (permalink) Old 04-11-2012, 01:08 PM
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Let me guess Mad....I say "Check what nuts?"...and you fire back Deez nuts....ha ha very funny...

Good suggestions from both you and Sub. Will spend a bit of time checking this weekend !
It's always a good thing to apply hi-temp anti-seize to the head pipe nuts.
Otherwise they will corrode onto the studs due to heat, rain, etc.
Shearing off a stud is not a pleasant thing.
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post #9 of 25 (permalink) Old 04-11-2012, 02:24 PM
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If you are hearing more than usual then your exhaust packing might be getting to the point that it needs replacing.

Have you done the PAIR mod yet?
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post #10 of 25 (permalink) Old 04-11-2012, 02:40 PM Thread Starter
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Thanks Sub...I will source some and have that done as well.

Hi Mike...long time my friend....the PAIR MOD was done, and I had not realized it. B Miller showed it to me 2 weeks ago and I have felt stoopid ever sense. Had not thought about the packing, the cans are a little over 14 months old....how do I check for that ? I assume I remove the cans from the mids...but after that ?

2001 SP1 - Code Name F-Bomb - PCIII USB / D&D High Mount System / 42T / EK SRX 530X / CRG Levers / K&N Filters / Stomp Grip / Rev Limiter Mod / Flapper Mod / PAIR Mod / Undertail / Hugger / 6K HID Lights / Speigler lines / Wave Rotors / CF Airbox / Shorai Battery - More to come, as soon as my slush fund get's more "Slushy" !
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