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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #81  
Old 2nd October 2022
73HEAD 73HEAD is offline
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73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future
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Originally Posted by 73HEAD View Post
thanks for the reply steve, ok cool. i want one. whats the correct name of this tool and any ideas where to source it. are they complicated to use. etc etc
i just googled em.
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  #82  
Old 2nd October 2022
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Ferrous Head Ferrous Head is offline
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I use one made by FAST. (Fuel Air Spark Technology.)

Cost me $450 when I bought it. There are others, some petty cheap.

I bought the one I have because it does both Gas and Methanol. It also has a data logger so I can record what's actually happening under race conditions.

My mate Rex has one with a handlebar mounted analogue meter. It's very easy to see if it's running too rich or too lean at any point. He rides a very highly tuned two stroke and they seize in a heartbeat if they go lean.
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  #83  
Old 2nd October 2022
73HEAD 73HEAD is offline
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Originally Posted by Ferrous Head View Post
I use one made by FAST. (Fuel Air Spark Technology.)

Cost me $450 when I bought it. There are others, some petty cheap.

I bought the one I have because it does both Gas and Methanol. It also has a data logger so I can record what's actually happening under race conditions.

My mate Rex has one with a handlebar mounted analogue meter. It's very easy to see if it's running too rich or too lean at any point. He rides a very highly tuned two stroke and they seize in a heartbeat if they go lean.
thanks. as im in aus like you, what one would you suggest for my 73xlh. it can be a cheapy as long as it does what i need it to do. thanks
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  #84  
Old 3rd October 2022
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sungod sungod is offline
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Why not call Mikuni Oz and explain your issue. After all you are a paying customer and they are located down under.
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  #85  
Old 4th October 2022
davixlrtt davixlrtt is offline
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https://www.gunson.co.uk/product/G40...-Plug-Kit-14mm
Use it for idle, intermediate and main circuits as long as your not burning any oil.
……Davi.
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  #86  
Old 4th October 2022
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Ferrous Head Ferrous Head is offline
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Originally Posted by 73HEAD View Post
thanks. as im in aus like you, what one would you suggest for my 73xlh. it can be a cheapy as long as it does what i need it to do. thanks
Search on Ebay for "Air Fuel Ratio Gauge W/ Wideband O2 Oxygen Sensor"

You might want to research "Narrow" vs "Wide" band sensors before buying.

Wideband covers a wider range and is (I think) more accurate. They need to be at operating temp before they work and will include a heating element. That means, a connection to your battery. (Switched of course).

The unit I have is big and intended for cars. But not a problem on my sidecar.

You need to weld a bung into your exhaust system. I run 2 into 1's mostly so it goes just after the collector entrance.

But you can mount it on either the front or rear exhaust pipe. The differences will be tiny. Being fed by the same carb.

You can buy conversion kits to add a second sensor and check both pipes but I do not think that's necessary.

If you don't want the sensor on their permanently you can use a bung or just use a second (spare) exhaust pipe to do your checking. One you have the jetting right you won't need to change it unless you make major changes to the engine.

Given the price I paid for mine divided by the number of engines I've used it on it's cost me a little less than $100 to do each engine. But then, like I said, I bought a duel (Gas/Methanol) meter with data logging. So, a bit pricier than most will pay.
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  #87  
Old 4th October 2022
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Ferrous Head Ferrous Head is offline
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This MIGHT be the one Rex is running on his LC359

https://www.ebay.com/itm/20406761663...Bk9SR_ClvID0YA
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  #88  
Old 4th October 2022
Chuckthebeatertruck Chuckthebeatertruck is offline
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but dynos havent been around as long as carbies
Ready to have your hair blown back . .

The dyno was invented in the 18th century --several designs actually.

First one received a patent in 1817.

"Carbies" came a wee bit later.

Motorcycle companies have been using dynos since the 1920s to develop their products. Air tunnels since the 1940s.

Analog computers for testing; including lambda sensors -- since the 1940s.

None of this is new stuff and PROFESSIONAL automotive and diesel mechanics have had access to all these tools in large professional shops for 60 plus years. Our family dealership bought its first tail pipe sniffer in the early 1960s and by 1980 we had a wide variety of computer based tools in the HOME shop. Those were all dealership cast offs from the early 70s. I got my first electronics repair lessons repairing those machines and oscilloscopes. yep, we used scopes a LOT for ignition work.

It's diy mechanics that are finally catching on to a lot of these tools because they are now very cheap and readily available.

But they are not new -- at all.

And no one is preaching crazy tech when promoting this stuff. Is it necessary -- no, not at all. Does it allow an "ok" diy mechanic to achieve much better results -- YES.

A good professional or well experienced amateur can come very close without the stuff.
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  #89  
Old 4th October 2022
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You could just read the plugs and give the engine what it's asking for.
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  #90  
Old 4th October 2022
73HEAD 73HEAD is offline
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73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future
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Quote:
Originally Posted by Chuckthebeatertruck View Post
Ready to have your hair blown back . .

The dyno was invented in the 18th century --several designs actually.

First one received a patent in 1817.

"Carbies" came a wee bit later.

Motorcycle companies have been using dynos since the 1920s to develop their products. Air tunnels since the 1940s.

Analog computers for testing; including lambda sensors -- since the 1940s.

None of this is new stuff and PROFESSIONAL automotive and diesel mechanics have had access to all these tools in large professional shops for 60 plus years. Our family dealership bought its first tail pipe sniffer in the early 1960s and by 1980 we had a wide variety of computer based tools in the HOME shop. Those were all dealership cast offs from the early 70s. I got my first electronics repair lessons repairing those machines and oscilloscopes. yep, we used scopes a LOT for ignition work.

It's diy mechanics that are finally catching on to a lot of these tools because they are now very cheap and readily available.

But they are not new -- at all.

And no one is preaching crazy tech when promoting this stuff. Is it necessary -- no, not at all. Does it allow an "ok" diy mechanic to achieve much better results -- YES.

A good professional or well experienced amateur can come very close without the stuff.
wow, thats interesting. thanks mate. there is so much i dont know. i appreciate all this stuff a lot. thanks to everyone that puts their bit in. take care
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