Premium Member 2and3cylinders Posted September 23, 2022 Premium Member Share Posted September 23, 2022 1 hour ago, texscottyd said: Hey Bret, did I mention that I have a new Speed Twin? ‘Cause, you know… I have a new Speed Twin. 😀😀 I farta in yourll generale directionione Though my fav scene 1 Link to comment Share on other sites More sharing options...
Ride On Posted September 29, 2022 Share Posted September 29, 2022 Here's my factory installed plugs as removed with about 22,000 miles. It ran fine, I just decided to replace them during the valve adjustment. 1 Link to comment Share on other sites More sharing options...
peteinpa Posted September 29, 2022 Share Posted September 29, 2022 center electrode looks a little rounded off. 22k might be too high. I'll be doing 16k miles valves and plugs. Link to comment Share on other sites More sharing options...
skipperT Posted September 29, 2022 Share Posted September 29, 2022 (edited) @Ride On look fairly decent with good color, your bike must be flashed. what does the gap measure? -Skip Edited September 29, 2022 by skipperT Link to comment Share on other sites More sharing options...
priebe Posted September 30, 2022 Author Share Posted September 30, 2022 Thanks all for the great feedback. Consensus seems to be; change them at valve adjustment. Link to comment Share on other sites More sharing options...
Premium Member 2and3cylinders Posted September 30, 2022 Premium Member Share Posted September 30, 2022 I disagree but what do I know 😄 You can also do it when you flush and fill the radiator You can just tip the radiator forward it's easy no hoses need be disconnected having the air injection plumbing gone makes it even easier 8, 10 to 14000 miles for normal steel core electrode spark plugs is maximum without inspection Link to comment Share on other sites More sharing options...
Ride On Posted September 30, 2022 Share Posted September 30, 2022 20 hours ago, skipperT said: @Ride On look fairly decent with good color, your bike must be flashed. what does the gap measure? -Skip No flash, engine and it's accessories are stock. I didn't measure the gap, just set them aside - might still have them... I agree. Good color (and combustion). 50+ MPG with short windshield and no bags, 40 MPG with 24" Madstad windshield, side and top case. Always 87 octane except 3 tanks prior to storage, then it's gets non-ethonol premium. Recently finished a 4,300 road trip. Ran perfect. 27,000 miles on it now. 1 Link to comment Share on other sites More sharing options...
Premium Member 2and3cylinders Posted September 30, 2022 Premium Member Share Posted September 30, 2022 Nice fastest red I see you tolerate the saddle couldn't do that love My sergeant though I have a lean tush It's my hips that give me problems Link to comment Share on other sites More sharing options...
Warchild Posted April 9, 2023 Share Posted April 9, 2023 On 9/30/2022 at 9:18 AM, 2and3cylinders said: I disagree but what do I know 😄 You can also do it when you flush and fill the radiator You can just tip the radiator forward it's easy no hoses need be disconnected having the air injection plumbing gone makes it even easier 8, 10 to 14000 miles for normal steel core electrode spark plugs is maximum without inspection Since my CRS is in full bloom - 🙄 - this was the specific spark plug access info I was trying to remember this morning. Thank you, Brett. And not to reignite this old spark plug thread - but I am also in the camp that says don't put this off much beyond the Service Interval. Years ago, that interval was 12,000 miles. Nowadays, the Manual calls for 8K interval. So why the change? I still have contacts within the Yamaha Technical Division in Georgia, and put the question to them last year. They said that in today's modern engines with high-powered ignition systems, you can't just 'look' at a plug to determine if it's good. The telltale indicator is the amount of internal resistance that has built up in the plug with use. The reason you change them at 8K is that this is the mileage where they are seeing higher resistance built up. This forces adjacent components (coils, etc) to work that much harder to make the spark plug fire. Sure, you could probably use them beyond that mileage without a lot problems, but replacing them keeps the overall ignition system humming along nicely. Mind you, I am just repeating what they told me. 🙃 But they seemed to make a compelling argument. 1 Link to comment Share on other sites More sharing options...
Rick123 Posted April 9, 2023 Share Posted April 9, 2023 Just wondering - how often you replace spark plugs in your car? Does 8000 sounds right to you now? 1 Link to comment Share on other sites More sharing options...
Lone Wolf Posted April 9, 2023 Share Posted April 9, 2023 4 hours ago, Warchild said: ... They said that in today's modern engines with high-powered ignition systems, you can't just 'look' at a plug to determine if it's good. The telltale indicator is the amount of internal resistance that has built up in the plug with use. The reason you change them at 8K is that this is the mileage where they are seeing higher resistance built up. I have heard the term "resistor" spark plug, but never really thought that much about it. The stock plug for Tracer is NGK CPR9EA-9 and the "R" stands for resistor. A quick search = resistor to reduce radio interference, which doesn't really matter to me. But the following video by NGK explains that the interference they are blocking also relates to "computer controlled" engine components (ECU). This is an interesting article by NGK "Most resistor spark plugs use a monolithic resistor, generally made of graphite and glass materials, to filter the electrical voltage as it passes through the center electrode. Since resistor type plugs actually “resist” some of the spark energy, non-resistor type plugs actually deliver a more powerful spark. It is for this reason that most racing plugs are non-resistor types. However, in most automotive applications, a resistor plug is required for proper vehicle operation. " --- My Chevy dealer told me the interval on my Tahoe was 100,000 miles and the original plugs were in there to 110,000 with no noticeable difference when changed. I never really knew this was a thing, but research finds that spark plug resistors can develop too much resistance and that is something that can be measured. I had no idea. 1 2 1980 Yamaha 850 Triple (sold). Too many bikes to list, FJ-09 is next on my list Link to comment Share on other sites More sharing options...
Ride365 Posted April 9, 2023 Share Posted April 9, 2023 13K miles on my originals, bike still runs like a raped ape and idles like a Rolex. 2 Link to comment Share on other sites More sharing options...
Premium Member 2and3cylinders Posted April 11, 2023 Premium Member Share Posted April 11, 2023 Now I gotta replace my plugs soon! Gee thanks But I can do in less than an hour just tipping the rad Bought another set of stock plugs at PartShark today for $5.50 each, cheapest I found them. Also bought a new set of throttle cables for $34 per Brian's recommendation to ease up effort. The old set I'll lube again and keep them as backup but at 58k miles it should help my right wrist. Was going to try the TB cam mod but this will be easier next I have the airbox off. Link to comment Share on other sites More sharing options...
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