SL 650 Spark Plug type

[rob2337]

Hello,

Quick question, my girl firend uses my sl650 all the time, and she doesn't push the machine too hard (ie half throttle). Today I had a fouled plug when I checked them. The thermostat has been removed. I am going to replace the plugs soon, so should I look at running hotter plugs then the stock, or the stock ones.

Thanks.

[ZMANN]

no! run the 8's unless you have an on going problem! then post back because plugs are cheaper than holed pistons!

[rob2337]

so br8es or b8es plugs, right?

[xlint89]

BPR8ES is what a 650 would use

[ZMANN]

U want the R for resistor! and the p is projected tip that has little effect in my book but if u can find them I'd run what xlint said! Z

[xlint89]

I don't know why the projected tip is recommended in earlier models. But it does change in 96 to the non projected Anyone know why?????.

[ph2ocraft]

The projected tip developes more heat within the combustion chamber. With poorer fuels and heavier work loads I think the BR8ES would be a better choice??
I would think with a basically stock boat the BPR8ES will be just fine.

[ZMANN]

I've run both and noted absolutely no differences in performance! on a side bar I am puzzled as to why some people who say running premix will foul plugs faster! I have never fouled a plug!

[xlint89]

Thanks for the explaination Ph20. Z, I think they are running the wrong gas/oil ratio when they say that. I've never fouled a plug either. And my girl and I did a LONG "no wake" river ride once. Around 1/2 hr each way, with no issues.

[ZMANN]

. Z, I think they are running the wrong gas/oil ratio when they say that. .

So your saying their stupid!