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oldbugs
Samba Member
Joined: September 16, 2002
Posts: 185
Location: Deerfield Beach, FL.
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 Posted: Sun Nov 09, 2008 5:27 pm Post subject: Alot of popping |
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My buddy has a 2110, its starting to pop thru the exhaust ALOT at a sustained speed like on the highway. What would cause this? There's about 1500 mi. on the engine, maybe it needs a valve adjustment?
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junior55
Samba Member
Joined: October 01, 2006
Posts: 941
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| Posted: Sun Nov 09, 2008 5:45 pm Post subject: |
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I would have gotten in about 2 v-adjustments by 1500 mi.
That would be the first thing I would check. |
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Bill271
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Joined: July 06, 2008
Posts: 761
Location: escondido
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| Posted: Sun Nov 09, 2008 6:03 pm Post subject: |
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Ya gotta give us more to go on than that..is it dual carbed single whats the timing etc..........  |
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oldbugs
Samba Member
Joined: September 16, 2002
Posts: 185
Location: Deerfield Beach, FL.
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| Posted: Sun Nov 09, 2008 7:46 pm Post subject: |
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Dual 44 idf's, 010 at 32*, he's had a few valve adj. since it was built, 044's w/ 42-37 ss valves. Runs good, pulls hard but pops at a steady speed, only thru the exhaust. I guess we'll check the valves, maybe a little tight? Thanks
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Bill271
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Joined: July 06, 2008
Posts: 761
Location: escondido
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| Posted: Sun Nov 09, 2008 8:15 pm Post subject: |
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| Is it doing it at light throttle or more? id check too see if the idle jets are too lean |
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DarthWeber
Samba Member
Joined: November 24, 2007
Posts: 7543
Location: Whittier,CA
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| Posted: Sun Nov 09, 2008 8:15 pm Post subject: |
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| This may be a long shot but, on some IDF carbs, there are air bypass screws which need to be closed completely or you'll get unmetered air entering the carb. These screws are located next to the idle mixture screws at the base of the carb. Perhaps they vibrated loose?? Also, "the question", the carbs are jetted and tuned properly for the engine, correct? |
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Kelley
Samba Member
Joined: April 03, 2003
Posts: 1432
Location: "Die Sonneküste" Crystal Beach, FL
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| Posted: Sun Nov 09, 2008 8:21 pm Post subject: |
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| oldbugs wrote: |
| Dual 44 idf's, 010 at 32*, he's had a few valve adj. since it was built, 044's w/ 42-37 ss valves. Runs good, pulls hard but pops at a steady speed, only thru the exhaust. I guess we'll check the valves, maybe a little tight? Thanks |
Using a 010 distributor, I'd back down on the distributor timing to 28º-30º. 32º is a bit much. Check those valve adjustments again.
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oldbugs
Samba Member
Joined: September 16, 2002
Posts: 185
Location: Deerfield Beach, FL.
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| Posted: Sun Nov 09, 2008 8:23 pm Post subject: |
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Carbs are jetted and synced (spelling?) correct. It pops on any steady rpm, the higher the rpm the more pop...pop...bang...pop... I'll check for anything "loose" on the carbs.
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junior55
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Joined: October 01, 2006
Posts: 941
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| Posted: Mon Nov 10, 2008 6:59 am Post subject: |
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| You say this engine ran fine earlier on?? |
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Jeff Pyzyk
Samba Member
Joined: May 02, 2007
Posts: 80
Location: Milwaukee
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| Posted: Mon Nov 10, 2008 9:17 am Post subject: Popping at steady speed |
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1) Check to see if idle jets are clogged. Blow out the idle jets. Take the carb tops off, blow out the idle circuits through the idle jet holes with compressed air.
2) Check for intake leaks by spraying hair spray around the intake manifolds where they bolt to the head. Sometimes a leaky intake can cause popping.
3) Sometimes an exhaust leak can cause backfiring, but usually on the over-run. Check for exhaust leaks.
Most probable cause is #1 above. |
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