Navigation

You are here: Home / Messages / Commando / Kicking back

Kicking back

Up to Commando

Kicking back

Posted by william_youngson at June 01. 2017

I am trying to start my newly rebuilt 72 Interstate,I have new battery,coils,leads,plugs and Boyer,I have checked timing,connections over and over again,battery fully charged but it just kicks back. I have a weak right leg and can't give it the kick I would like too,am I right in thinking that if I can't kick it over fast enough it would kick back?

Re: Kicking back

Posted by john_holmes at June 01. 2017

Assuming you have not yet strobed it and only timed it using the Boyer stator holes and their instructions you need to know these normally give an over advanced timing, so knock it back a few degrees at a time until it starts and then strobe it and adjust accordingly. Only then will you know if you are kicking it too weakly, on my 850 if I do not try hard enough I get a gentle pushback and mine is a Boyer timed correctly so no reason yours should not the the same. Now my B44 will kickback even with the same boyer box, it's the nature of the engine.

Re: Kicking back

Posted by william_youngson at June 01. 2017

Previously john_holmes wrote:

Assuming you have not yet strobed it and only timed it using the Boyer stator holes and their instructions you need to know these normally give an over advanced timing, so knock it back a few degrees at a time until it starts and then strobe it and adjust accordingly. Only then will you know if you are kicking it too weakly, on my 850 if I do not try hard enough I get a gentle pushback and mine is a Boyer timed correctly so no reason yours should not the the same. Now my B44 will kickback even with the same boyer box, it's the nature of the engine.

Thanks for your reply. Got my son(big strapping lad)to kick it,still kicking back so did as you said and retarded it a touch,a bit better,retarded a bit more and no more kicking back and running. Still having trouble strobing it accurately (see my last post,10 posts ago,re rotor timing marks) I have remarked the rotor with a white line using a degree disc to find 31 deg but I am finding it difficult to see it clearly,perhaps it's the old strobe,might invest in a new one, anyway it's seems to be running quite nicely,just have to set up the carbs now.

Re: Kicking back

Posted by karl_nixon at June 01. 2017

Years ago (4 decades if am honest) my father bought a posh (we were easy to impress back then) Gunson engine tuning kit with strobe light compression tester and other things in a big box (he still has it on its own shelf in his garage it was that expense back in the day). The light was the type that just connects to the HT. lead and plug if you lite a candle a mile away you would see better than the dim red flicker. After hours with head deep in the engine bay of the mk3 Cortina in a dark garage with the light off he gave up and bought another Gunson strobe  (it was all you could get back then) but this far more advanced item connects to the battery and a single wire between plug and lead. As they say "AND THERE WAS LIGHT" (you still had to guess as old Ford timing marks gump all over the place). After years of sitting in the back of his garage (modern cars and bikes need no such attention) it now  does my Commando thanks dad and all the other tool to. The point of this rambling is that strobes with external power supply are the best and if not grovaling in a dark garage/shed my help or outside in the dark at night (amusing the neighbours)

Re: Kicking back

Posted by john_holmes at June 01. 2017

Karl +1, get a modern strobe with separate 12v feed from your car battery.

Re: Kicking back

Posted by william_youngson at June 01. 2017

Previously john_holmes wrote:

Karl +1, get a modern strobe with separate 12v feed from your car battery.

Sounds like I have the same Gunson strobe as Karl had,just plugs into the spark plug and plug lead, I will get a new one. Many thanks for your input and Karl's.

Re: Kicking back

Posted by richard_payne at June 01. 2017

Check that the battery truly has 12.5 volts and try swapping the pickup leads over. A Commando always requires a fair effort to spin it but shouldn't kick back violently if everything is set up correctly.

Re: Kicking back

Posted by david_evans at June 02. 2017

My mains powered Gunson works very well though I expect the 12v battery powered ones should be just as good. That along with a Morgantune carb balancer are a must if you want to take the guessing out of running a Commando.

Re: Kicking back

Posted by william_youngson at June 02. 2017

Previously david_evans wrote:

My mains powered Gunson works very well though I expect the 12v battery powered ones should be just as good. That along with a Morgantune carb balancer are a must if you want to take the guessing out of running a Commando.

Never heard of Morgantune,is it a vacum gauge? I have had a look on eBay but nothing there but plenty of other makes of twin cylinder kits though,would you recomend trying to find the Morgantune?

Re: Kicking back

Posted by john_holmes at June 02. 2017

Also known as Colortune, not sure when Morgan came into it.

 

http://www.carbtune.co.uk/carbdtls.html

 

In independent tests Carbtune has been superior 
to any other carburettor synchronizer.

The Carbtune Pro comes in two forms:

  • 2-column system for twins
  • 4-column system for fours, triples, or twins

Re: Kicking back

Posted by david_evans at June 02. 2017

Apologies, yes Morgan Carbtune to take the guessing out of balancing the carbs, along with a Gunson Strobe to take the guessing out of the timing = a sweet running Commando. Colour tune is for checking the mixture but IMO is a bit tricky because you can't very well load up the engine to see what is really going on.

Re: Kicking back

Posted by Neil Wyatt at June 03. 2017

William:

I appreciate kick back is your issue but add to that.

1) Ensure sump is drained

2) Use 20/50 oil or the like.

I had all sorts of trouble kicking over my Mk 3 850 before I moved back to 20/50. Now just one swift kick and it starts before it has chance to kick back. I use a 1989 Boyer and it will kick back with a flat or duff battery.  Good luck.

Re: Kicking back

Posted by Julian Wells at June 03. 2017

At the risk of turning this into a thread about vintage strobe lights, 40 years ago I too had one of the kind in which both power and signal were achieved by interposing the strobe between coil and spark plug.

I have to say that I don't remember lack of light being a particular problem, but then again this was 40 years ago.

Since I still have it I'll have to drag it out and see if it still works.

 

Previously john_holmes wrote:

Karl +1, get a modern strobe with separate 12v feed from your car battery.

Re: Kicking back

Posted by william_youngson at June 05. 2017

Previously Julian Wells wrote:

At the risk of turning this into a thread about vintage strobe lights, 40 years ago I too had one of the kind in which both power and signal were achieved by interposing the strobe between coil and spark plug.

I have to say that I don't remember lack of light being a particular problem, but then again this was 40 years ago.

Since I still have it I'll have to drag it out and see if it still works.

 

Previously john_holmes wrote:

Karl +1, get a modern strobe with separate 12v feed from your car battery.

Hi Julian, Just out of interest I have just received a new Draper strobe in the post and went right out to the bike to test it, what a difference! I can now make out the marks as clear as day,well worth getting an up to date one. Billy.

Powered by Ploneboard
Upcoming Events
Tay Valley Branch Camping Weekend - Strontian Jun 23, 2017 - Jun 24, 2017 — Sunart Camping,Strontian, Acharacle PH36 4HZ
Surrey branch at the Brooklands Motorcycle Day Jul 02, 2017 10:00 AM - 05:00 PM — Brooklands Museum, Brooklands Road Weybridge Surrey KT13 0QN
CRMC Track Parade - Croft Jul 08, 2017 - Jul 09, 2017 — Croft Circuit, West Ln, Dalton-on-Tees, Darlington DL2 2PL
2017 Mallory Bike Bonanza Jul 08, 2017 - Jul 09, 2017
Notts Branch Annual Concours Night Jul 12, 2017 07:30 PM - 10:30 PM — The Fox, Kelham near Newark
Upcoming events…
This is Brio Diazo Plone Theme