Backfire and popping out of right side exhaust

[Traumahawk]

Finished it up last night. Fired it up and synced the carbs with my digi sync. Noticed that the bike had a hard time staying at 1000 rpms. Idle would fluctuate. Would idle between 980-1040ish. Normal??? Anyways, got the carbs in sync. Have not had a chance for a test ride yet. Hopefully tomorrow. [emoji16]


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Mine is rock steady.....did it have issues staying at idle before all of this?

 

[Jpick77]

Well... I attributed the fluctuation to the digital readout if the digi sync and how it references it's rpm by vacuum pulses. I synced the carbs last fall and it did the same thing before the mods. All readings on the digi sync were fluctuating a little. All carb readouts were within two digits. Suggestions??


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[Traumahawk]

When was the last time the valve settings were checked? I know that can affect engine vacuum, and I believe that it was Damon that proved that.

 

[Jpick77]

https://vimeo.com/169782142 sounds better. Getting ready for a test ride


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[blaxmax]

https://vimeo.com/169782142 sounds better. Getting ready for a test ride


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That sounds good.

 

[caseyjones955]

Sounds crisp and consistent to me, never heard dual pipes before.

 

[Jpick77]

That sounds good.

Thanks! Only got to idle around the neighborhood this evening. My 4 year old wanted to ride with daddy. Lol. Hopefully tomorrow I will take it out and all will be good. [emoji16]


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[Jpick77]

Sounds crisp and consistent to me, never heard dual pipes before.

Thanks! Delkevics with the baffles in. Little louder than my modified stocks and a LOT quieter than with the baffles out! Lol.


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[Jpick77]

Well, started up to take a test ride today finally... Again the popping is back. Didn't make it out of the driveway. My son and I rode it around the neighborhood for an hour the other day and all was good. Going to shotgun one more time.


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[sdt354]

Might be time for inspection of all the carb, vboost, rubber boots. Air box tight?

 

[veebooster]

Also check that your needles/slides are moving freely.

 

[Jpick77]

Thanks. Will check. Hopefully going to get to work on it this evening. Slides and needles looked great along with the diaphragms. I notice when I drain the bowls. Some bowls have a better flow than others which lead me to thinking its junks some debris in the bowls. Eventually I will get it all out. I hope


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[Jpick77]

Round four... Lol


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[blaxmax]

Have you changed the gas line and filter? I added a filter after the stock one.

 

[Jpick77]

Ok. I think the problem is sediment in the bowls themselves. I drained them again and got some more junk out of them. I took the main fuel line of the carb bank and cycled the fuel pump a couple of times into a container. Fuel is clean and clear. I did install a new fuel filter. Took a little ride and the bike is a little better but not 100%. Seems like it would stumble a bit and then come on strong. That was just gently rolling the throttle. A/F screws are between 1 1/2 to 2. One carb seems to not be affected by A/F adjustment. Going to drain carbs again and see if any more junks comes out. Again I think my problem is crap into bowls...


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[Jpick77]

Update:

Well. After several attempts
To diagnose my issue I went ahead and went back to square one. My issues arose after installing cops, plugs, and doing the shotgun procedure.

Well, first thing is I removed the cops and reinstalled the stock coils and wires. Then I drained the bowls again and performed the shotgun procedure. I then took of the fuel line after the new fuel filter and placed it in a can of sea foam. I cycled the fuel pump a couple of times to fill the bowls with sea foam and let it set for 24hrs. I then drained the bowls and let the pump refill the carbs with fuel. I set my A/F screws to 2 1/2 turns. I hit the button and it sounded good. I just finished and 40 mile ride and so far so good. I'll keep you all posted.


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[ColoNat]

Well..... ????

 

[blaxmax]

Well..... ????

I'm sure he will let you know this weekend as I re-sent him a replacement set of cops.

 

[Jpick77]

Well... Lol. I've ridden about two hundred miles and haven't had any issues. Just trying to fine tune my a/f screws. As for the popping, that was somewhat noticeable last fall before the COPS install.


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[Jpick77]

A big shout out to Blaxmax he has been more than helpful. My hat is off to him he stands behind his product.


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