engine noise

drg650 · 05-02-2007, 06:26 AM

i have a 1982 yz 250.i just purshased it.when it rev the engine,and when the engine is coming down on it revs i hear a loud rattling noise.would anyone know what the problem could be or is it normal.

tigmaster · 05-02-2007, 06:54 AM

a lot of people have this problem and it turns out to be a wrist pin or connecting rod bearings. however before you check the engine check all other components like a loose exhaust or an old chain. has the bike ever had any engine work done to it? and if so, when and what?

drg650 · 05-02-2007, 08:04 AM

Im not sure i just got the bike two days ago.I payed 1250 for it.The bike is in better shape then most early 2000's.lol.I want to find out the problem before i cause damage.Could a water pump cause that type of noise.

tigmaster · 05-02-2007, 01:40 PM

usually not, the only real component of the water pump that could make this noise would be the impeller if it were broken, and if it were broken you would see coolant boiling out of the overflow tube. if you are sure it is an engine noise then i would go with the wrist pin or rod bearings. it could be a real loose piston, but you would normally hear that noise all the time. so if you are sure that its engine troubles then u might want to pull the engine. check everything obvious before doing this of course, but then pull the head and cylinder. try to rock the piston side to side the opposite way the bearings are . you will feel some play but u should be able to tell if its excessive. then pull the piston. look at the sides of the piston for strange wear marks or anything obvious. then look at the wrist pin (the piece of shiny metal that holds the piston to the connecting rod) look for any wear or obvious signs. check the cylinder walls also. feel the top of the cylinder for a lip or look for any wear or obvious markings in the cylinder. rock the connecting rod opposite of the bearings also and check for an excessive amount of play. these are just a few things to check. let me know if u have questions are find out the problem.

drg650 · 05-03-2007, 05:46 AM

Thank you very much for your insite.I will look inside the engine this weekend.Just to double check the engine only makes this noise when coming down on its revs.I dont hear this noise when at idle or reving up just when you let off on the trottle.
thank you

tigmaster · 05-03-2007, 01:42 PM

ya when the noise is only happening when spooling down it usually indicates something in the linkage between the piston and crank

drg650 · 05-09-2007, 07:20 AM

I just wanted to say thank you for you insite.I was positive it was bearings in the engine.But it turns out it is spring and exhaust noise.no big deal i can live with a noise.just wanted to say thanks again you saved me a pile of $.

JThompson · 05-09-2007, 09:20 AM

Thank you for coming to us. And thank our resident expert tigmaster helping everyone with their mechanical problems. We love him around here

drg650 · 05-09-2007, 11:34 AM

tigmaster you rock.you saved me a pile of money.You where right it was the exhaust spring.thanks again.

tigmaster · 05-09-2007, 09:11 PM

no problem, glad i could help

05-02-2007, 06:26 AM	#1 (permalink)
drg650 C Rider Join Date: May 2007 Location: Everett Canada Posts: 19 iTrader: (0)	engine noise i have a 1982 yz 250.i just purshased it.when it rev the engine,and when the engine is coming down on it revs i hear a loud rattling noise.would anyone know what the problem could be or is it normal.

05-02-2007, 06:54 AM	#2 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	a lot of people have this problem and it turns out to be a wrist pin or connecting rod bearings. however before you check the engine check all other components like a loose exhaust or an old chain. has the bike ever had any engine work done to it? and if so, when and what? __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

05-02-2007, 08:04 AM	#3 (permalink)
drg650 C Rider Join Date: May 2007 Location: Everett Canada Posts: 19 iTrader: (0)	Engine Noise Im not sure i just got the bike two days ago.I payed 1250 for it.The bike is in better shape then most early 2000's.lol.I want to find out the problem before i cause damage.Could a water pump cause that type of noise.

05-02-2007, 01:40 PM	#4 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	usually not, the only real component of the water pump that could make this noise would be the impeller if it were broken, and if it were broken you would see coolant boiling out of the overflow tube. if you are sure it is an engine noise then i would go with the wrist pin or rod bearings. it could be a real loose piston, but you would normally hear that noise all the time. so if you are sure that its engine troubles then u might want to pull the engine. check everything obvious before doing this of course, but then pull the head and cylinder. try to rock the piston side to side the opposite way the bearings are . you will feel some play but u should be able to tell if its excessive. then pull the piston. look at the sides of the piston for strange wear marks or anything obvious. then look at the wrist pin (the piece of shiny metal that holds the piston to the connecting rod) look for any wear or obvious signs. check the cylinder walls also. feel the top of the cylinder for a lip or look for any wear or obvious markings in the cylinder. rock the connecting rod opposite of the bearings also and check for an excessive amount of play. these are just a few things to check. let me know if u have questions are find out the problem. __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

05-03-2007, 05:46 AM	#5 (permalink)
drg650 C Rider Join Date: May 2007 Location: Everett Canada Posts: 19 iTrader: (0)	Engine Noise Thank you very much for your insite.I will look inside the engine this weekend.Just to double check the engine only makes this noise when coming down on its revs.I dont hear this noise when at idle or reving up just when you let off on the trottle. thank you

05-03-2007, 01:42 PM	#6 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	ya when the noise is only happening when spooling down it usually indicates something in the linkage between the piston and crank __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

05-09-2007, 07:20 AM	#7 (permalink)
drg650 C Rider Join Date: May 2007 Location: Everett Canada Posts: 19 iTrader: (0)	Engine Noise I just wanted to say thank you for you insite.I was positive it was bearings in the engine.But it turns out it is spring and exhaust noise.no big deal i can live with a noise.just wanted to say thanks again you saved me a pile of $.

05-09-2007, 09:20 AM	#8 (permalink)
JThompson Administrator Join Date: Aug 2006 Location: Bellingham WA Posts: 4,916 iTrader: (6)	Thank you for coming to us. And thank our resident expert tigmaster helping everyone with their mechanical problems. We love him around here __________________ Tired of ads? Become a member for an almost ad free site! Also we give away monthly prizes just for posting! Register today! Looking for places to ride! Want to review a riding area? Check them out! PRE-ORDER MOTOTIPS Stickers now. Help keep mototips running! Get your order in today! Buy NOW! Special Discounts for members only! Check out our new discount forum for retailers offering to help you save money! Mototips Discounts

05-09-2007, 11:34 AM	#9 (permalink)
drg650 C Rider Join Date: May 2007 Location: Everett Canada Posts: 19 iTrader: (0)	Thank you tigmaster tigmaster you rock.you saved me a pile of money.You where right it was the exhaust spring.thanks again.

05-09-2007, 09:11 PM	#10 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	no problem, glad i could help __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

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