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post #1 of 19 (permalink) Old 01-06-2012, 04:43 PM Thread Starter
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back fire sp1 2000

Hi i have a problem with my sp1 2000 , I have back fire . You can see on this movie
. That's cool but i think thats its not good to engine . When i make a litle bit longer a exhaust system (you can see on this movie http://www.youtube.com/watch?feature...83U-NhW8#t=44s )problem was gone . But i think engine dont have a power .I dont make a dyno run . And my sp1 take lot o fuel 70mil and i have yellow light to tank . So what can i do with this ?

And sorry for my langue i come from europe .
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post #2 of 19 (permalink) Old 01-06-2012, 07:46 PM
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This is normal if the PAIR emission control system is still intact.

The PAIR system allows clean air to enter the exhaust during times of low pressure (like when your throttle is closed) to promote additional burning of the exhaust.

When you briefly revved your engine, the extra air from the PAIR system raised the air/fuel ratio to a lean enough point where the unburnt fuel ignited (hence the pop).
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post #3 of 19 (permalink) Old 01-06-2012, 09:30 PM
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I dont think the europe model had the pair system(here in NZ we got the europe model and mine does not have pair system), check the fuel pressure regulator.
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post #4 of 19 (permalink) Old 01-06-2012, 10:29 PM
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Next item on your agenda is to get a custom map for your bike. Dyno is a must if you expect good performance. IMO



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post #5 of 19 (permalink) Old 01-07-2012, 05:30 AM Thread Starter
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http://www.ebay.com/itm/02-06-2004-H...#ht_500wt_1202

This is the pair valve ???

I dont have something like this in my bike , i think so .
An Earlier owner start at my bike in the race . So i have k%n filter . Clean snorkel without valve . And Leo vince exhaust . And could make some changes in injection system . Becouse when I give the full throtle and release throtle , and at this same time turn off the injection with the red button .There is no back fire .
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post #6 of 19 (permalink) Old 01-07-2012, 11:45 AM
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I dont think the europe model had the pair system(here in NZ we got the europe model and mine does not have pair system), check the fuel pressure regulator.
Only Australian model(U)have not pair.
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post #7 of 19 (permalink) Old 01-07-2012, 11:58 AM
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Originally Posted by mondo View Post
I dont think the europe model had the pair system(here in NZ we got the europe model and mine does not have pair system), check the fuel pressure regulator.
According to the UK service manual, the Euro E, ED, and F types did.
The U models shipped to Australia and NZ did not.
I've seen photos of Aussy valve covers and they only had unfinished castings for PAIR valves.
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post #8 of 19 (permalink) Old 01-07-2012, 12:12 PM Thread Starter
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so where should be located the pair valve in my bike ? in exhaust system ??
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post #9 of 19 (permalink) Old 01-07-2012, 12:23 PM
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Here is where the PAIR valve is located on each cylinder head.
It's located next to the spark plug, with the hose attached.
Inside is a flame arrestor and reed valve.

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post #10 of 19 (permalink) Old 01-07-2012, 03:04 PM
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When I had my Two Brothers exhausts installed, I had a lot of pops when I closed the throttle like dear Sub said above. After a while i installed the PCIII usb with Dyno's map for 2bros and all the pops just gone. Even with the flapper fully on permanently......


My Íhlins Project: https://www.rc51forums.com/forums/showthread.php?t=6033
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Congratulation to MakisRC51 for winning the 2014 Bike Of The Year Contest!
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