It sounds like you found the current problem. But it can also indicate other issues. I really like and use green lock tight on assembly bolts and nuts for the Honda 600 engines.
The engine has a tendency to shake itself apart.
On the modifications you are looking at. Miles has addressed several of the areas we all should be looking at before getting over zealous in performance modifications. Remember that the 36.5 c.i. 36hp engine is already built to perform better than most 600 cc engines. The weakest links are the problem. To name a few - Oil pump rod and eccentric, transmission ball bearing units, needle bearing thrust washer, the crankshaft, poor oil filtering and the points breaker plate ignition system.
I, as well as others have several crank shafts resting in our garages with bad bearings waiting for a solution. Back in the early years of the N600 a company put out a larger piston kit that went through many crank shafts. A 35 year old crank shaft has lots of wear, along with many of the other parts.
What we should do is find a company that will rebuild crank shafts, modify the oil filter to remote spin on oil filters (the reason being that the oil lubricates both engine and transmission allowing more metal and other imperfections to work their way into the aluminum roller bearing cages housed in the crank shaft and other bearing surfaces) and sleeve the eccentric to the oil pump with steel rather than leaving the aluminum surface the oil pump rod rides on now.
Miles made a steel oil pump rod that I personally liked a lot and have used in several engines with a steel sleeved eccentric. It makes the oil pump almost bullet proof, and cost about $150.00 for the modification. The remote oil filter system is about another $150.00 and the spin on filter is a PH8A that runs in the price range of $2.50 each. Then there is the Oil Cooler, very cool.
Casey, I agree with the argument that fuel injection and electronic ignition are the best, but how many miles are we putting on these cars? Cost to use value is a bit over the edge.
As for the Carburetor, why can't we use another one? Alcohol in the fuel we use these days are eating up the rubber and other seals in the carb. I have 6 carbs that have shaft vacuum leaks because the seal is gone. Maybe Fuel Injection is a bit exotic for what we have. A better carb or Viton seals might be the next move.
Bill
> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > kcandthez > Sent:
> Thursday, December 20, 2007 9:45
> PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> [2cylinderhondas] Re: Ideas before I tear open the electrical > system......
> Thanks for all the ideas, I tend to start with the easiest thing and
> work myself backwards. As soon as I pulled the cover I saw the
> problem, the washer on the end of the camshaft bolt wasn't there! I
> just had a pretty little bolt and no washer holding on the lobes. So I
> am actually impressed that it lasted 400 miles before it rose enough to
> jump off of the 3mm pin. Any way all is well in the world and the Z is
> running again.....Good day.
> KCandtheZ