AJS Very poor starting advice needed

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
Member
Posts: 101
Joined: Sun Jan 24, 2016 7:19 pm
Location: BERKSHIRE UK

Re: AJS Very poor starting advice needed

Postby Iron Head » Mon Aug 19, 2019 11:24 am

I can certainly relate to a lot of this and the learning curve I have gone through with my ‘48 G80. With my pre-monobloc I find no more than a tickle so as it just ‘weeps’ from the main jet venturi and no choke and she usually goes third kick. Hot, just turn on the gas and no throttle and off she should go. Although rebuilt, my magneto spark isn’t the best and I find NGK Iridium (non resistor) plugs work well in enhancing the spark.

Iron Head

Member
User avatar
Posts: 872
Joined: Mon May 01, 2017 6:32 pm
Location: Lancashire

Re: AJS Very poor starting advice needed

Postby spookefoote1956 » Mon Aug 19, 2019 11:30 am

Interesting. I use iridium plugs on my bikes but they have been converted to electronic ignition. I thought they weren't advisable to use on mags.
हरे कृष्ण हरे कृष्ण
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!

Member
User avatar
Posts: 440
Joined: Sun Apr 19, 2015 8:13 am
Location: Somerset, UK

Re: AJS Very poor starting advice needed

Postby thornebt » Mon Aug 19, 2019 6:54 pm

Iron Head wrote:I can certainly relate to a lot of this and the learning curve I have gone through with my ‘48 G80. With my pre-monobloc I find no more than a tickle so as it just ‘weeps’ from the main jet venturi and no choke and she usually goes third kick. Hot, just turn on the gas and no throttle and off she should go. Although rebuilt, my magneto spark isn’t the best and I find NGK Iridium (non resistor) plugs work well in enhancing the spark.

Iron Head


I didn't think NGK made any non-resistive Iridium spark plugs. The 'R' in the plug number specifies that they are a resistor plug e.g. BKR6EIX, BR9EIX, CR9EIX etc.

Cheers. Bruce.

Member
Posts: 101
Joined: Sun Jan 24, 2016 7:19 pm
Location: BERKSHIRE UK

Re: AJS Very poor starting advice needed

Postby Iron Head » Mon Aug 19, 2019 7:48 pm

Sorry guys you are quite correct that the iridium plugs have resistors but I took the advice from Matchless Clueless where he, I believe quite correctly, advises that the fine electrode wire these use work well with magnetos. Certainly seems to get a good spark for me.

Member
Posts: 106
Joined: Tue Aug 30, 2011 3:35 pm
Location: DEVON UK

Re: AJS Very poor starting advice needed

Postby oldandsmelly » Tue Aug 20, 2019 7:52 am

Just to add to the Iridium plug chat.... I used these on my magneto fired twin. They worked great for about 3000 miles and then it became an erratic starter. When I removed the plugs the pointy electrode had eroded away to leave a massive gap. So, for me they were good but short lived.

Member
Posts: 101
Joined: Sun Jan 24, 2016 7:19 pm
Location: BERKSHIRE UK

Re: AJS Very poor starting advice needed

Postby Iron Head » Tue Aug 20, 2019 10:12 am

That’s very interesting to hear I’d better monitor my iridium erosion levels, although 3000 miles will be about 10 years riding for me on this old girl with no lights etc and I can hopefully afford the £8.00 or whatever for iridium. The iridium thing probably is all snake oil anyway, I’m still chuckling at the ridiculously blue fat spark the ‘54 CS is producing on its 1950’s American Champion plug!

Member
Posts: 2105
Joined: Wed Oct 12, 2005 9:45 pm
Location: N YORKS UK

Re: AJS Very poor starting advice needed

Postby 56G80S » Wed Aug 21, 2019 3:21 pm

Always used Champions with the SR1 mag and in 30+ years they've worked for me.

Johnny B

Previous

Return to G80 / Model 18

Who is online

Users browsing this forum: No registered users and 10 guests