Question about 1996 Honda CB 750F2 Seven Fifty

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Engine clicking noise

Sounds like tappets only on cold start goes after 3 or 4 minutes

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Hello, Many years ago Honda had severe problems with K2 and KZ cams and lifters giving us many headaches. However in modern engines a lot is down to hydraulic lifters/ cam followers and suitable oil, believe it or not the wrong grade can make a whole heap of difference also leaving service intervals too long stretches the life of the lubricant. Remember these are high revving engines so take a lot out of any oil.
Are you using a synthetic lubricant, your environment can alter the viscosity i.e. cold climate thinner oil warm environment medium very warm thinnish.
Although the noise you are experiencing is acceptable at the moment if it gets worse or takes longer to clear a top end internal inspection will be required.
For now if it were me I would be double checking the grade/quality of your oil, then change it and a new Genuine oil filter .
Good luck! I hope this helps?
Paul 'W'
Onyer~EDson(:0)~[><

Posted on Dec 06, 2008

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Top End noice


Not a lot of information but I assume you're asking about some noise in the top end of your engine on your Heritage.

A Harley-Davidson engine is of an older design being that the valves are pushrod operated. It is not an overhead cam design like a lot of other bikes that try to look like Harleys. Harley has decided to stick with this design for as long as they can because it lends itself to what most Harley riders are looking for in their bikes, the traditional look lines and sound of the older motorcycles.

As such, there are a lot of components in the top end that must have some "running clearance" in order to operate. Push rods, rocker arms, rocker arm bushings, and such. A slight clatter or tapping noise in not uncommon. Now, it the noise if loud enough to make people turn their heads when you start the bike, you may have a problem. Usually a serious problem in the top end of the engine results in a poorly running engine as well.

You engine is equipped with hydraulic tappets. As the engine runs and things start to expand, the tappets are "pumped up" with oil to maintain a "zero clearance" in the valve train. If you have a tappet gone bad, it will make a loud erratic tapping noise that is sometimes accompanied by a bad running engine. You could have lost a roller on the end of a tappet as well. The Twin Cam engine was designed to help remedy the problem with the valve train geometry in the Evolution and earlier engines. It did straighten the pushrods up a bit but I still think it's possible to lose a tappet roller. If the noise is this loud, you will have to pull the tappet blocks and inspect the tappets to see if you have lost a roller.

Good Luck
Steve

Jul 19, 2010 | 2001 Harley Davidson FLSTC - FLSTCI...

1 Answer

I get a loud ticking noise at times not all the time even at high rpms seems to be comeing from front of bike


I assume that the noise is coming from the engine. If so, it sounds like the classic bad tappet roller. Each tappet has a roller on the end of it that follows the cam. In other words, you have roller tappets in your engine. Since I cannot hear the noise, I'm making a guess here at best. It'll be up to you to determine exactly where the noise is coming from and if it is the tappets causing the noise.

These tappet rollers are notorious for going bad at around 25 to 30K miles. I have seen them go bad as early as 13K and run as long as 75K. You never know how long they're going to last. They start off with an intermittent knock but they'll get louder shortly. The front exhaust tappet is usually the first one to go since the angle of the pushrod is so steep.

To check the tappets is a bit of a job. First you must take the rocker box covers off the engine. With those off, rotate the engine until one of the cylinders is at TDC with the valves closed. Take the large bolts out of the lower rocker plate on the right side. This will allow you to get the rocker shaft out of the rocker arm. Tap the shaft out and remove the rocker arm of both the intake and exhaust valves. Now, you can remove the pushrod and the pushrod tubes. Take the four small bolts out of the tappet block and remove the tappet block. The tappets may fall out and into the cam chest but you can get them out. If you get the tappet block loose and kind of roll it out quickly, you may can get it out without the tappets falling out. Once you get the tappets out, inspect the roller carefully, Make sure they don't have any slack in them and that they roll freely.

Now turn the engine over until you get the other piston to TDC and do the same thing on the other cylinder.

note: the best way to roll the engine over is with the rear wheel. Raise the rear wheel off the ground and put the transmission in fifth gear. Turn the rear wheel in the direction of rotation with the spark plugs out of the heads.

If you find a bad roller, carefully inspect the cam lobes for wear or roughness. When you put the tappet blocks back on the engine, you must have a set of alignment pins with which to properly align the tappet blocks. Jim's tools makes the pins.

Good Luck
Steve

Jun 03, 2010 | 1993 Harley Davidson FXR Super Glide

1 Answer

Hard knock but not all the time


Without being able to listen to engine, I'm just going to have to guess at a few things.

My first guess would be a tappet roller going bad. The tappet rollers on Harley engines are kind of "iffy" sometimes. I've seen them go bad in as few as 13,000 miles and I've seen them still running strong at 75,000 miles. So, it's no telling when they might go bad. However, I have found that if they are going to give trouble, usually it's between the 25,000 and 35,000 mile point.

They'll start out with a intermittant knock to begin with and get worse as time goes on. The problem is that while you're trying to figure out what is knocking, it's doing a job on your camshaft. Usually when a tappet goes bad, the roller stops turning. When this happens, it galls the surface on the cam lobe it rides on destroying the cam. Generally, you can count on replacing at least one tappet, the cam, the inner cam bearing, and gaskets on the tappet blocks, nose cone, push rod tubes, and upper rocker boxes.

I have seen one other thing that made a noise like that before and it was on a '84 Shovehead with about 25,000 miles on it. The bike would run perfectly while cruising down the road regardless of speed. But, when you rolled a little throttle on and put a load on the engine, it would sound like someone with a sledge hammer inside of it. After checking everything on the engine, I pulled the sprocket shaft seal. The outer Timken bearing was gone. No rollers, no cage, just two races. Even the seal was in perfect condition. I can't explain it but we had to do a complete overhaul on the engine to put a new set of Timken bearings in.

Now, the Timken bearing engine was non-typical but the tappet problem is all too typical. Even the improved tappet design used in the Evo engine still gives problems. That would be my best "GUESS" at this point.

Good Luck!

Jan 02, 2010 | Harley Davidson FLSTC Heritage Softail...

1 Answer

Has a noise in rear head checked vavle check comes on uder accelr


Did you check your tappets? This is one of the weak areas in all Harley engines other than the V-rod engine. Each tappet has a roller on the end of it. These rollers will fail and cause all sorts of problems. If one locks up, it will scar the camshaft making replacement of the tappets and the camshaft a requirement.

I'm not sure about the Twin Cam but on the Evolution engines, you must have a set tappet block alignment pins to reinstall the tappet blocks. They're available through Jim's tools.

Oct 27, 2009 | 2002 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Ive got a tapping noise from the top end of my 125cc hypster


If the sound is light and regular it could be your tappet setting is a little too wide. This is a simple engine andif it is not too loud you could probably leave it, otherwise any motorcycle repair shop could reset it quite quickly. The problem is the tappets need to be set with the engine cold.

May 25, 2009 | 2003 Kymco Hipster 125

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