Topic: Listen to my engine, what would you do/start with ?

[Bailgang]

Hi Viktor.What i am hearing is a loose cam chain and noisy primary chain likely caused by out of sync carburators.At the least do a full tuneup and oil change and if you plan to do any work yourself get a shop manual and preferably a genuine Honda version.    Rock On

+1 on the carb sync. Carbs out of sync combined with a sloppy cam and or primary chain can make it sound like the engine's falling apart.

[bollingball]

As a mentioned I have the clymer and the 270 page owners manual ..Victor ICBW but the owners manual is the small little book that usually goes under the seat when new. The big one is referred to as the (Service or shop Manual) It covers more engine work where the owners manual does not. No big deal I am just trying to see if we are talking about the same thing. The (service or shop manual) can be down loaded here.
http://www.sohc4.net/index.php/cb750/cb750k/books-manuals-guides/

Ken

[Viktor.J]

As a mentioned I have the clymer and the 270 page owners manual ..Victor ICBW but the owners manual is the small little book that usually goes under the seat when new. The big one is referred to as the (Service or shop Manual) It covers more engine work where the owners manual does not. No big deal I am just trying to see if we are talking about the same thing. The (service or shop manual) can be down loaded here.
http://www.sohc4.net/index.php/cb750/cb750k/books-manuals-guides/

Ken

Oh snap ! I meant shop manual, i have the shop manual that you linked, 270 pages
But It doesn't says in which order I should do the tuning
But as long as im fine with these books thats great

[bollingball]

Tune Up

a.   Compression test
b.   Tighten cylinder head bolts (see Ch. 4, Camshaft)
c.   Cam chain adjustment
d.   Rotate clock wise until it is at 15deg. ATDC line up index mark to the left side of spring post. Keep tension on with large breaker and magnet. Then loosen adjuster and nut
e.   Valve clearance adjustment In+.002  EX+.003 T mark TDCC
f.   Spark plugs  8.7-13.7 Ft lb
g.   D8ea .024-.028
h.   Condenser (capacitor)
i.   Breaker points .012-.016 Do set 1-4 first
j.   Ignition timing
k.   Air cleaner
Carburetion (if needed)

 This is the order I use. I don't do a & b every time. If anyone thinks it is wrong please say so.
Ken

[seanbarney41]

Tune Up

a.   Compression test
b.   Tighten cylinder head bolts (see Ch. 4, Camshaft)
c.   Cam chain adjustment
d.   Rotate clock wise until it is at 15deg. ATDC line up index mark to the left side of spring post. Keep tension on with large breaker and magnet. Then loosen adjuster and nut
e.   Valve clearance adjustment In+.002  EX+.003 T mark TDCC
f.   Spark plugs  8.7-13.7 Ft lb
g.   D8ea .024-.028
h.   Condenser (capacitor)
i.   Breaker points .012-.016 Do set 1-4 first
j.   Ignition timing
k.   Air cleaner
Carburetion (if needed)

 This is the order I use. I don't do a & b every time. If anyone thinks it is wrong please say so.
Ken

Ken, I don't think you are wrong but what is up with ..."Keep the tension on with large breaker and magnet." ...explain a little more I've never heard of this

[burlybear]

subscribed

[1976verona]

I can hear a steady hum of the cyls so I don't thinks it's misfiring just start by adjusting the cam chain tension. Remove the tensioner assembly and clean and make sure the plunger is not stuck and rusted in the housing. After cleaning apply grease or anti-sieze to the plunger stem and push it into the housing and tighten the bolt. reinstall it in the engine and then loosen the set bolt to let the plunger slide in against the chain. Set the engine to 15 degrees per the service manual before removing the plunger. My bike had the same noise and after performing this repair mine runs very quiet now.

[bollingball]

Tune Up

a.   Compression test
b.   Tighten cylinder head bolts (see Ch. 4, Camshaft)
c.   Cam chain adjustment
d.   Rotate clock wise until it is at 15deg. ATDC line up index mark to the left side of spring post. Keep tension on with large breaker and magnet. Then loosen adjuster and nut
e.   Valve clearance adjustment In+.002  EX+.003 T mark TDCC
f.   Spark plugs  8.7-13.7 Ft lb
g.   D8ea .024-.028
h.   Condenser (capacitor)
i.   Breaker points .012-.016 Do set 1-4 first
j.   Ignition timing
k.   Air cleaner
Carburetion (if needed)

 This is the order I use. I don't do a & b every time. If anyone thinks it is wrong please say so.
Ken

Ken, I don't think you are wrong but what is up with ..."Keep the tension on with large breaker and magnet." ...explain a little more I've never heard of this

With the plugs out the engine is very easy to turn over. So once you get to the 15deg. spot it can roll backwards and if it does your slack in the chain can be off. To keep the engine from moving I do this.

[seanbarney41]

ok, gotcha...that yellow thing is a big ole' magnet?

[bollingball]

ok, gotcha...that yellow thing is a big ole' magnet?

Yes I usually fish off bridges with on a long 30ft parachute cord as a kid we would find guns bikes just about everything.
Ken

[dave500]

magnet fishing,i didnt know fish had that much iron in them.