Backfiring and detonation problem - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum
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post #1 of 18 (permalink) Old 07-19-2019, 06:49 AM Thread Starter
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Backfiring and detonation problem

Hello all! Sorry for my grammar(
I have a 2008 Boulevard c50, and for almoust half a year I have a problem with detonation and backfiring. It starts only when the bike is hot, when you try to accelerate fast from low RPMs, you can hear detonation sound from the engine, also sometimes you can hear a pop from the exaust pipe when you ride on middle RPM with no trottle. My pipes and tail light are covered with black soot. I tryed to change the petrol, changed the sparks, air filter, TPS sensor, 3 times I cleaned the injectors, cleaned fuel filters and everything inside my tank. I've tryed octane boosters and fuel injector cleaners, but nothing seems to help. I live in Vietnam, we dont have any qualified mechanics here, so I do it by myself, learning step by step. May be someone can help me? Where to look? What else to check?
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post #2 of 18 (permalink) Old 07-19-2019, 07:36 AM
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Try the pair valve disconnect, or removal if proven defective. Suzuki C50 and Volusia are nearly the same set-up.

Volusia Pairvalectomy

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post #3 of 18 (permalink) Old 07-19-2019, 10:56 PM Thread Starter
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Try the pair valve disconnect, or removal if proven defective. Suzuki C50 and Volusia are nearly the same set-up.

Volusia Pairvalectomy
Thank you! Can you tell me, why it should help? Why people do this?
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post #4 of 18 (permalink) Old 07-20-2019, 03:05 AM Thread Starter
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On my bike it is different
https://www.impex-jp.com/catalogs/mo...ir-209538.html
no connection to the fuel system
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post #5 of 18 (permalink) Old 07-20-2019, 07:47 AM
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The pair valve is an anti-pollution/emissions device, which frequently goes bad, causing symptoms very similar to those You are experiencing.

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post #6 of 18 (permalink) Old 07-20-2019, 01:33 PM
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Greetings from Indiana. Glad you're here.

I can head East or West, it doesn't matter as long as it's on 2 wheels.
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post #7 of 18 (permalink) Old 07-21-2019, 12:21 AM Thread Starter
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Originally Posted by Psyc0 View Post
The pair valve is an anti-pollution/emissions device, which frequently goes bad, causing symptoms very similar to those You are experiencing.
Did it today in the morning. No change, stiil same problems
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post #8 of 18 (permalink) Old 07-21-2019, 07:33 AM
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Have the valves been adjusted recently?

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post #9 of 18 (permalink) Old 07-21-2019, 08:08 AM Thread Starter
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Have the valves been adjusted recently?
Yes, We did it like in manual. Things got worse after that I think... I have a lot of rust in my tank, I will try to clean it on this week
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post #10 of 18 (permalink) Old 07-21-2019, 01:02 PM
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Yes, We did it like in manual. Things got worse after that I think... I have a lot of rust in my tank, I will try to clean it on this week

Did You only turn the crankshaft counter-clockwise, or did You use clockwise motion, when performing the valve adjustment?

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