new here and to norton

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ozbowhunter

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Apr 25, 2015
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hi all im mark from Australia but living in florida
I am in to classic British and have a 1965 triumph Bonneville I am joining here because a good friend of mine has been building a 1970 Norton custom
now please don't be upset he had to custom it because all he had was half the frame and an engine so it was easier for him to build hisown style then to restore

ok so on to a problem that's new to me
we finally got the bike running and riding well I will post a pic if I can
but we noticed that it keeps spilling oil out the engine breather will this be because it has sumped ? if so we thought of that and drained the oil from the bottom plug but there still seems to be oil coming out the breather have we missed something is there something we need to look into im new to nortons but I believe they are very similar to triumphs in engine style but this has got me stumped any help would be great
new here and to norton
 
ozbowhunter said:
it is open air to under the bike should be plumb it back to the tank?
Click to expand...

yes, The early bikes (I have a '70 myself) have a timed breather disk on the end of the camshaft so the port is open when the pistons decend. Oil always travels out the breather with air, so the standard commando configuration has the breather tube travel back to the oil tank to return the oil to the system. The oil tank in turn has a turret shaped bulge on top of it that the oil tank's air vent tube sticks up into so the oil tank can release the pressure surge of air created in the tank from the breather tube without spitting out a lot of oil from the tank along with the pulse of air...

Nice bike BTW, I always wanted to build a rigid norton when I saw this triumph in a magazine...

new here and to norton
 
Love its slutty school girl refined minimalist look but might get egged at INOA rallys. I am Miami native in hey day of Florida life style and times. Just posting to say be aware the primary chain must be set what seems too slack when cold or can severely tighten up hot to even bend trany shaft and mess up bushes. Shift difficulty can be 1st clue. Reed valves are the hot cake item last few years but they can be made oil time stick with old school once plumbing right. A light Commanod sure likes a bit taller gearing to keep in mind with time to renew tranny sprocket. In case you are unaware of it Fla Stone Crab claws in season might be the single best seafood there is.


new here and to norton
 
Yes, the breather tube off the left side of the crank case near the front is usually sent back to the oil tank. If you ride it enough, like every day, you might get by with a catch bottle. But if you let it sit for weeks, a lot of oil (ounces not pints) will come out of that breather when you start it. You can drain the sump and put it back in the oil tank and that should produce minimal oil out the breather tube. Or you can run the breather way to the back and hope it doesn't get on the rear tire.

Good minimalist look.
 
In some of us it invokes a British mini skirt model desire to ride.

new here and to norton
 
that is some wonky shifter. I'd think that shift knob would be virbatin and shakin so much you'd have a hard time grabbing it. Also trying to figure out that air filter arrangement.

Most Nortons, stock anyhow, don't like to be overfilled with oil, they will blow out the excess until they hit their happy level, somewhere around half way. Not sure how that might relate to your custom tank. How much oil does it hold?
 
I think the oil tank holds around 2 quarts maybe a little more, as for the shifter it works well, very little vibration there is also a lever system to soften the clutch designed by my friend which works very well the bike is very ridable the air filter are vintage horn tubes that curve out from the carbs
as I said this was about putting a almost dead Norton back on the road rather then it becoming lawn art or a boat anchor lol could not let that happen
 
[quote="

Nice bike BTW, I always wanted to build a rigid norton when I saw this triumph in a magazine...

new here and to norton
[/quote]

I will post a pic of my triumph soon you might like it as well it looks a close style to the hard tail pic you posted
 
ozbowhunter said:
I will post a pic of my triumph soon you might like it as well it looks a close style to the hard tail pic you posted
Click to expand...

Cool, I look forward to seeing it.

I hope my discription of the '70 commando crankcase breather helped you get the plumbing routed correctly. You really need to return a breather line to the oil tank and then have a breather set up off the oil tank to exhaust the pulse of air and leaves the oil that travels up from the crankcase in the oil tank to be recirculated.
 
yes it helped alot the plumbing is done and a new test ride this Friday will keep you informed thanks for all the information
 
ozbowhunter said:
as I said this was about putting a almost dead Norton back on the road rather then it becoming lawn art or a boat anchor lol could not let that happen
Click to expand...


Like you say, you use what you have and if you get a ridable bike out of it all good in my books, its diffrent and you will get some fun out of it, who cares what others say, all my friends criticise me when i first converted my Commando to a Featherbed frame, but to me it was the best thing I ever done, its diffrent and not to many around with a Norton engine in, most Featherbeds become Tritons.

Just enjoy what you have.

Ashley
 
ok I said I would keep you posted
today we had it running with the new breather system and it was a success .....but a new issue has risen we have been having some backfiring so I had another look at the carbs heres what happened
the bike starts but seems to backfire on the right side I try to adjust the timing but no improvement, so we decided to look at the needles they seem very big[fat] we raised them and tried again this time we had good idle but we had no adjustment with the idle screw in other words it runs on good idle without them touching the slides
so do they have the wrong jets and needles for a 750[my buddy purchased the carbs separately from the engine so they could be off anything]
is there a starting point for the carbs such as what would be the correct jets and needles for a 750 we can then check to see what we have
 
From the looks of your picture, you have a pair of Amal 930's which are correct for that engine.

Explain "backfire",.... Do you mean when you try to kick the bike over it backfires through the intake or are you talking about backfire out of the exhaust???

backfire through the intake when you try to kick the bike over is usually caused by a lean fuel condition. With amal carbs you have to use the bleeder on the side of the carb to press the floats down to fill the carbs with fuel before you kick the bike or the bike will backfire sometimes. Some people also use the choke lever, I just twist the throttle slightly and that adds some fuel to the start up process.

Backfiring out of the exhaust is usually your ignition cutting in and out, so an unburned charge of fuel is pumped into the exhaust pipe and then it is ignited when the ignition cuts back in and it lights up that fuel up in the exhaust
 
my friend has looked at the carbs and told me they are 932 but the needles seem very big as I said the best idle we get is with them at there highest slot and no idle screw adjustment so they are to the bottom fully what would becthe correct jetting and needles as for the backfiring it is in the right exhaust what can we
do to eliminate this
 
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