Erbman02,is it possible they gave the the wrong heat range plugs that simply fouled because they were 1 or maybe even 2 heat ranges colder then they were supposed to be?

Just wondering because n general NGK makes a good quality spark plug.

OOPS,UPDATE,JUST ,REMEBERED READING YOU SAID THOSE PLUGS LOOKED LIKE THEY WERE BURNING OK SO THEY WERE NOT TOO COLD AND FOULED.

Also,i have noticed a few times you stated your bike has 100k miles on it?

Am i understanding that correctly and if so has the motor & or anything else like trans or clutch on your bike ever been appart for repair in all those 100k miles?

Thats sure a lot of miles to get out of an air cooled V-twin motor without at least a top ewnd rbld along the way.

Scott

scottw wrote:
Erbman02,is it possible they gave the the wrong heat range plugs that simply fouled because they were 1 or maybe even 2 heat ranges colder then they were supposed to be?

Just wondering because n general NGK makes a good quality spark plug.

OOPS,UPDATEJUST ,REMEBERED READING YOU SAID THOSE PLUGS LOOKED LIKE TERE WERE BURNING OK SO THEY WERE NOT TOO CLD AND FOULED.

Also,i have noticed a few times you stated your bike has 100k miles on it?

Am i understanding that correctly and if so has the motor & or anything else like trans or clutch on your bike ever been appart for repair in all those 100k miles?

Thats sure a lot of miles to get out of an air cooled V-twin motor without at least a top ewnd rbld along the way.

Scott

yep, you read it right, I'm at 107k miles, tranny recall at 47k. Still stock belt, stock clutch plates with a mod to the clutch spring plate, using a Virago1100 plate piggy back on stock spring plate due to install of 42hsr carb that gave me a nice boost in power and caused slippage in all gears, this mod came by 30yr wrench recommendation, at least 50k on this set-up and all is fine. Replaced iridium plugs with autolite 4164 yesterday morn and vibrations are gone, drove me nuts for the past month, so bad that hands would get numb, and my bike never did that. All started a few weeks after I put the iridium plugs in, did a filter change, and thats when I noticed the vibes, was a slightly smaller filter than what I had, so of course went back to my old filter after I cleaned it and vibes still there, then found my accelerator pump rod was frozen up in the rod guide, fixed that, vibes still there, then found my seating of carb in manifold was off kilter (my install fault) fixed that with new boot, vibes still there. Then thought about plugs, so checked to ensure they were in properly, check for fit of wires, all tight. vibes still there, replace plugs, vibes gone. And btw, there are a few roadies out there with over 200k and no rebuilds to them.

probably a defective plug, it happens occasionally, The fun part will be figureing out which one...

Wow, and I was planning on switching to the Iridium's myself.

Plugs seem to be like oil every bike has it's fit, whether the owner likes it or not. If you do get plugs advanced auto is cheaper most of the time and in stock. FYI

I just installed Iridiums in mine, no issus so far. But mine has a ported man, 42HSR, and a speedstar airr assy. So it helped it. The old yamaha plugs didnt cut it. The bike is so much more responsive now.

ghost_flamed wrote:
I just installed Iridiums in mine, no issus so far. But mine has a ported man, 42HSR, and a speedstar airr assy. So it helped it. The old yamaha plugs didnt cut it. The bike is so much more responsive now.

I didn't have an issue with the iridiums for the first month either, then all heck broke loose. Didn't think the plugs at first, they were new. so started to look into other factors, did find other issues, but no issue fixed solved the vibration any way. not until I replaced the plugs yesterday morn, and all is fine for the past 100 miles or so.

I just bought a set to install next spring after the oil change. Too close to time to put her up for the winter to install them now. Hopefully I will have good results. I'll let y'all know if I don't.

So who's been riding fine with them? Erbman, what year is your bike? Any special modifications?

I have an 01 with 42 carb with TPS mod, pumpless and Ben Hurr manifold, roadhouse 2 into 1 exhaust plugs have over 10,000 since I put them in they are fine wouldn't change. I also have a Dyna 3000 and Dyna coil solid wire. I can understand being frustrated but sounds like he is back to what works. I must say he is the first I have heard that had a problem.