Question about 1987 Honda CBX 750 F

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Very noisy engine at idle Rattles like cam chain. Noise goes away as you rev the engine. What do you think it could be?

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Could be the carbs are out of balance as this will cause lash noise at the primary drive gears as these are straight cut gears.

Posted on Nov 09, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: 1989 Dodge Raider timing chain worn out

I doubt it is the timing chain. More than likely it is the valves themselves, the seats wear out, and the lifters wear, so eventually the lifters don't pump up as full as they should, so it causes a gap between it and the valve, so it slaps the valve, also the seats wear, so the valve is kinda loose, so that causes a gap between it and the rocker shaft, so you get another slap. If the chain wore out enough to be hitting the block or front cover, you would be having timing issues because it would have to be pretty loose. You may also have a failing oil pump, so it is not suppling the right pressure, which is why you hear it at idle, because under load the pressure goes up and as I said it pumps up the lifter. This guy is a joke if he told you just to drive it till it blows, which would cause significant damage, Then you have to buy a what? use motor for $600 that is no better off than what you got? Then pay someone like this idiot $500 to install it? Right now you could probably rebuild the engine for about $600, and have a brand new fresh motor for your truck. The chain is not too difficult, you can do it in the car, but would be much easier out of it. The head doesn't have to be removed to do it, but you do have to take off the timing cover, which can be a pain, and possibly the water pump, all the engine pulleys, alternator, etc. So thats why I suggested pulling the motor. And, when it is pulled, it would be a great time to freshin it up with new pistons, rings, bearings, have the block done and rebuild the head.

Posted on May 15, 2008

chiquititas
  • 1010 Answers

SOURCE: mazda cx7 engine noise

Does the engine have hydraulic lifters? If so air can get into the chamber under the lifter and cause lifter noise.

Diagnosis and repair requires removing the Valve Cover. A fairly easy job for your local shop.

Posted on Jun 29, 2008

polarcycle
  • 1392 Answers

SOURCE: engine noise

Could be chain slack until it warms up. Check your tensioner, and possibly needs valve adjustment if it hasn't been done. On a worse note, could be oil pump taking time to get oil to the top end.

Posted on Mar 08, 2009

mecanica03
  • 874 Answers

SOURCE: Nissan Timing Chain still rattling

and the lower chain guides?

Posted on Apr 20, 2009

  • 420 Answers

SOURCE: noise in trans or in primary chain

It sounds like the primary drive chain is loose. The way I adjust mine is to take off the upper left inspection cover, start the bike and slowly tighten the adjuster until it starts to wine, then back off until it stops. Rev it slowly and listen for a wine. No wine good to go.

Posted on May 07, 2009

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My 2ltr V6 Vitara has a rattle. Top End noise, it rattles like noisy tappets on start up and gets less as the engine warms up (around five minutes) then it almost stops. So far I have pulled the rocker...


this is not SOLIDS engine, there is no LASH setting, !
the engine has a chain, and a set of hydraulic bucket valve lifters.
the chain can be bad or any lifter, can be dirty and collalpesd.
when the engine is dead and no oil pressure the lifters are normally collapsed, when you start the engine. oil pressure does 2 things
all lifters pump up, and clearance goes to zero. (no noise)
then the cam tensionor, pumps up (they fail) and chain noise ends.
some noise is ok , cold start, but most end after a minute or 2.
started.

ever read the manual? its here.
use a stethoscope to find out 1 thing , which is it the chain or lifters making that noise.
ive even runs engine with the valve covers off (messy , use a blanket to catch oil flying) to find the true cause.......

read the 2.5L here. its close. (mech. parts)
read the Alldata virtual FSM.

http://www.scantool.net/software/alldata-diy-1-month-subscription.html

Sep 12, 2013 | Suzuki Vitara Cars & Trucks

1 Answer

I own a 2004 BMW R1200CL. Almost every time I crank the engine I can hear the valves rattle. I have checked and adjusted the valve clearances to spec. The rattle goes away after the engine starts, but...


Yep, most of these bikes do rattle on startup. The noise is from cam chain slack. A hydraulic tensioner is used in the engine on each side as there are two cam chains. The tensioner leaks down after the engine sits for a while and the chain rattles for a few seconds till the tensioner gets pumped back full of oil again. Once the chain is tight again, then no noise.

BMW came out with an improved tensioner (doesn't leak down as quickly) that you can install on your engine to fix the rattle. Note that it is much easier to change the RHS tensioner than the LHS one.

Good Luck!

Sep 03, 2010 | 2004 BMW R 1200 CL

1 Answer

When warm i notice a cam chain type noise. could this be a worn cam chain tensioner . the bike has covered 36000 miles


it can either be a worn tensioner or need for a valve adjustment. if you rev the engine and noise goes away, you need a new cam chain tensioner. if the noise remains or gets worse when you rev it up, you need a valve adjustment and should replac the tensioner anyway. 36,000 miles on the motor is definitely mileage for an adjustment if it's never had one.

Jun 09, 2010 | 1999 Honda CBR 1100 XX Super blackbird

2 Answers

Growling engine noise only at idle. Cam area


Take all of the belts off for a short run at idle. If the sound goes away it is pulley related, spin each pulley and listen for bearing noise, also check for play at this time.

If the noise does not go away when the motor is driving no accessories you have a more serious problem.

Jan 13, 2010 | 1991 Oldsmobile 88

1 Answer

CLACKING NOISE FROM L/H CYLINDER


top end noise usaully the sign of needing a valve adjustment. some occassions just need a new cam chain tensioner. when you rev up engine rpms, if the sound goes away that means your tensioner is bad and not adjusting properly. if the noise gets worse then it's time to let a technician do his thing.

Dec 14, 2009 | 1996 Moto Guzzi Quota 1000

2 Answers

Rattles at low reves only


THE RATTLING YOU HEAR AT LOW R'S IS MORE THAN LIKELY THE CAM CHAIN RATTLING. THE CHAIN TENSIONER IS ADJUSTABLE TO A DEGREE BUT A BIKE OF THIS AGE(IF OVER SAY 10000 MILES) MAY NEED A NEW CHAIN TO ALLEVIATE THIS PROBLEM. LOOSE CHAIN CAN CAUSE CAM TIMING TO VARIATE CAUSING A SLIGHT MISFIRE.
THIS MISFIRE COULD ALSO BE THE RESULT OF DIRTY CARBS. IF SO THEY WILL NEED CLEANING AND SYNCING.

Oct 21, 2009 | 2000 Suzuki GSX-R 600

1 Answer

Noise in trans or in primary chain


It sounds like the primary drive chain is loose. The way I adjust mine is to take off the upper left inspection cover, start the bike and slowly tighten the adjuster until it starts to wine, then back off until it stops. Rev it slowly and listen for a wine. No wine good to go.

May 07, 2009 | 2002 Harley Davidson XL Sportster 883

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