Motor loud after warming up

therealmccoy · 01-22-2015, 08:51 PM

Need some advice. I got a 98 with the 295 in it. it starts great runs pretty good, has a quiet back fire when letting off the gas. I have the screw on the carb turned out probably 6-8 turns. If I screw it in the back firing gets worse. That being said my question is the motor is nice and quite for about the first 30 seconds then gets very loud. I don't believe it is a exhaust leak can't feel any air coming out of anywhere it shouldn't be, I have my valves set right. What else should I look for???? I don't think it is a rod knocking but it does get louder with high rpm's

1989Marathon · 01-22-2015, 08:53 PM

Can you post a video that shows the difference in sound?

therealmccoy · 01-22-2015, 10:07 PM

I will try to get one uploaded tomorrow. Thanks for the quick response

ezgo on fire · 01-24-2015, 10:12 AM

If its the original motor the connecting rods bolts are probably backing off. But usually they knock all the time. But weird things happen. If that idle screw is 6 turns out you need to rebuild that carb.

sccowboy · 01-24-2015, 10:35 AM

The backfiring can be caused by the butterfly in the carb not closing all the way just prior to the pedal micro switch opening. The knocking or "clattering", as was stated, could be the connecting rod cap bolts loosening up which will lead to eventual breakage of the con rod/s. If one breaks it can/will slap the block and could crack it. Maybe start with the key off and look into the carb throat while depressing the pedal. The butterfly should not move before you hear the click of the pedal micro switch. If it does then adjust the linkage of the throttle a little and test again.

therealmccoy · 01-24-2015, 07:47 PM

Thanks for the replies. I can not get a video that you can hear anything that is going to help. I'm sure it is the original motor. Thinking of sending in for a rebuildable core and stepping up to a 350. Any thoughts on good places to get a motor?

sccowboy · 01-24-2015, 07:50 PM

Depends on your budget but CT rebuilds makes a great drop in engine. Search the board and you'll find their number.

therealmccoy · 01-24-2015, 11:54 PM

I looked into the ct motors what all will I need if I go to a 375. Carb,coil anything else?

BrewCityMusic · 01-25-2015, 11:14 AM

everything is compatible except the carb, You'll reuse your entire electrical (coil, wires, etc) - it's definitely a noticeable increase in power, and it's about a 2-3hr swap front to back with simple hand tools.

therealmccoy · 01-25-2015, 07:15 PM

Sweet I'm calling tomorrow

01-22-2015, 08:51 PM	#1
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10	Motor loud after warming up Need some advice. I got a 98 with the 295 in it. it starts great runs pretty good, has a quiet back fire when letting off the gas. I have the screw on the carb turned out probably 6-8 turns. If I screw it in the back firing gets worse. That being said my question is the motor is nice and quite for about the first 30 seconds then gets very loud. I don't believe it is a exhaust leak can't feel any air coming out of anywhere it shouldn't be, I have my valves set right. What else should I look for???? I don't think it is a rod knocking but it does get louder with high rpm's
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10

01-22-2015, 08:53 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Motor loud after warming up Can you post a video that shows the difference in sound?
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

01-22-2015, 10:07 PM	#3
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10	Re: Motor loud after warming up I will try to get one uploaded tomorrow. Thanks for the quick response
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10

01-24-2015, 10:12 AM	#4
ezgo on fire Gone Wild Join Date: Apr 2014 Location: dallas tx Posts: 185	Re: Motor loud after warming up If its the original motor the connecting rods bolts are probably backing off. But usually they knock all the time. But weird things happen. If that idle screw is 6 turns out you need to rebuild that carb.

01-24-2015, 10:35 AM	#5
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Motor loud after warming up The backfiring can be caused by the butterfly in the carb not closing all the way just prior to the pedal micro switch opening. The knocking or "clattering", as was stated, could be the connecting rod cap bolts loosening up which will lead to eventual breakage of the con rod/s. If one breaks it can/will slap the block and could crack it. Maybe start with the key off and look into the carb throat while depressing the pedal. The butterfly should not move before you hear the click of the pedal micro switch. If it does then adjust the linkage of the throttle a little and test again.

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01-24-2015, 07:47 PM	#6
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10	Re: Motor loud after warming up Thanks for the replies. I can not get a video that you can hear anything that is going to help. I'm sure it is the original motor. Thinking of sending in for a rebuildable core and stepping up to a 350. Any thoughts on good places to get a motor?
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10

01-24-2015, 07:50 PM	#7
sccowboy It ain't gonna be easy. Join Date: Apr 2008 Location: St. George, SC Posts: 1,480	Re: Motor loud after warming up Depends on your budget but CT rebuilds makes a great drop in engine. Search the board and you'll find their number.

01-24-2015, 11:54 PM	#8
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10	Re: Motor loud after warming up I looked into the ct motors what all will I need if I go to a 375. Carb,coil anything else?
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10

01-25-2015, 11:14 AM	#9
BrewCityMusic Hammer Down !!!! Join Date: Jun 2010 Location: Lake Geneva, WI Posts: 2,681	Re: Motor loud after warming up everything is compatible except the carb, You'll reuse your entire electrical (coil, wires, etc) - it's definitely a noticeable increase in power, and it's about a 2-3hr swap front to back with simple hand tools.

01-25-2015, 07:15 PM	#10
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10	Re: Motor loud after warming up Sweet I'm calling tomorrow
therealmccoy Not Yet Wild Join Date: Apr 2013 Posts: 10

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