hey

[holysmokes]

Hey there

just joined, I am rebuilding a 1981 650 custom

cam chain broke, took out the tensioners also the primary chain tensioner

anyone got a primary tensioner to sell...john

[Chris]

Welcome! Sorry, I can't help you with the tensioner.

[Volker_P]

Welcome here, John!

Hey there

just joined, I am rebuilding a 1981 650 custom

Good decision! But always hard to start with a new bike when internal engine parts are gone. Was the cam chain really torn? (-> valves bent?) And what about primary chain tensioner? Just to be sure or also damaged? Be careful in case there was much metal or dirt on the oil filter screen. Maybe this engine was mistreated and it is more economic to have a look for another one. At least you should check everything before you start ordering parts. Have a look on gearwheels, internal gear shift mechanism and piston rings axial play. Valve mechanics/camshaft is obvious to check and rocker arms cams are worth a look, too.
Installing the cam chain tensioner correctly may be a bit tricky, but there should be a description with pictures here in the forum.

[holysmokes]

I took this on trade for my 1980 750c

the chain broke on the guy, and he didnt have the mechanical whereforall to fix it

Ive built rebuilt many honda dohcs and have owned at least 30 or so bikes, I am new at these 650 sohcs, are any engine parts interchangeable with other sohc hondas?

thanks, john

[Ibsen]

Hello John, and welcome to the forum.

There are not many, if any, of the engine parts that are interchangeable with other SOHC Hondas. Even if the 650 is said by some people to be just an over bored CB550, there are more to it than just that. Even if the 650 cylinders can be bolted straight on the 550 bottom end, the internals are not a direct match.
In fact, some people claim that the CB650 are the best SOHC engine Honda built.

If you are familiar with rebuilding the SOHC Hondas, the 650 shouldn't give you much problem really.

[holysmokes]

trouble is , many of the internals are NLA

I bought rear tensioner and front guide from a salvage yard in CT

a full gasket set from Ohio


wth the dohc , the engine needs to be pulled for any engine work, I like the idea of being able to pull the head , w/o remving the engine

I am going to relap and do the valve seals

hopefully be able to re-ring this engine[havent checked on rings, yet ]

Ill post pics later


ps.. maybe we can get this forum humming, gotta find a few more members, somewheres

the more, the merrier

[Vatch]

welcome to forum

Looking forward to the pictures and progross reports.

So you've had 30 bikes. Wow. How many in your stable now? What have you had?

[holysmokes]

99.3 % were crap, that I fixed and rode, one got killed by an apple tree[71 kaw 500h1]long story, you had to be there

heres a partial list

71 kaw 500h1
73 honda 350 twin
71 honda 350 twin
74 honda 350/4
74 350 yamaha rd 350
79 honda cb125
77 kawasaki kh100
79 honda 750k
3 1980 honda 750customs
1980 honda 750 super sport
1983 honda cbx550
78 kawasaki kz400
honda 50 moped
honda 70 moped
69 honda 450
many of these , I bought the second time, or took on trade, again

etc etc

get the picture

what ever was for sale ,needed fixing, I bought

I have my 81 650c that is in a state of flux

got another 1980 750c that is in pergatory

1981 750k in a couple of banana boxes

1980 750c in between riding and rebuilding

assorted things related to a 750 super sport. 1980s

my 16x18 shop is crammed with stuff


although my cravings are for two strokes, with the kyoto accord coming closer, I really should stop my two stroke fantasizing

those are gonna be non rideable in the very near future ..john