ContinuousWave
Whaler
Moderated Discussion Areas
ContinuousWave: Whaler Repairs/Mods
Fouled Plugs on 1996 Evinrude 90 HP
search | FAQ |
profile | register | author help
|
|
ContinuousWave Whaler Moderated Discussion Areas
ContinuousWave: Whaler Repairs/Mods
Fouled Plugs on 1996 Evinrude 90 HP
|
| Author | Topic: Fouled Plugs on 1996 Evinrude 90 HP |
| whalerajm |
posted 08-08-2008 11:42 AM ET (US)  
Any reason why my spark plugs seem to foul so quickly on 1996 Evinrude, 90 HP, (oil injection)? Usually pretyy fouled after 5-6 hopurs running time. Starting can be a challenge when plugs are fouled (duh!). I've actually started buying plugs by the case and changing them several times a season! This can't be normal. Any thoughts? Thanks Andy |
| newt |
posted 08-08-2008 11:45 AM ET (US)
Are you running the correct spark plug? Check here http://continuouswave.com/whaler/reference/BRP_SparkPlugChart2007.pdf What oil do you use? Try the OMC XD-30 if you haven't yet. I found it to be much cleaner than other brands. |
| whalerajm |
posted 08-08-2008 12:02 PM ET (US)
Thanks Newt, I checked the chart and it seems to advise either: I've been using NGK BPR7HS, because that's what my mechanic was using. Sounds like I may have been using wrong plugs! Andy |
| whalerajm |
posted 08-08-2008 12:19 PM ET (US)
I just confirmed that the NGK plug I've been using is the recommended (by NGK) plug for my OB. So maybe I need to try new oil... I believe the R is for "resistor", and per NGK: A: NGK "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking. NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics. They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, depth finders or whenever recommended by the manufacturer. In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion. Thanks Again |
| jimh |
posted 08-08-2008 12:28 PM ET (US)
I don't think that there are really three recommended plug types for your motor. If you have a VRO2 or OMS motor, you need to use plugs with RF suppressors. Unless you plan on sustained high-speed operation the correct plug is probably the Champion QL77JC4. There seems to some en vogue trend to use spark plugs from Japan, but I don't see any particular advantage. In the Champion plugs the RF suppressor is inductive, and it probably works better than a resistive element. |
| jimh |
posted 08-08-2008 12:31 PM ET (US)
If you want to check your spark plugs, the best way is to make a high-speed run for a few minutes, then shut off the motor and coast to the dock without idling. Pull the plugs and check them for fouling and for the color on the insulator. If I pull my plugs after idling around, they are always oily. Usually the spark gap erodes after about 25-hours. I notice the engine really likes the spark gap to be 0.030-inch. As it gets larger the engine does not accelerate as well under load. |
| whalerajm |
posted 08-08-2008 04:02 PM ET (US)
Thanks Jim |
| whalerajm |
posted 08-08-2008 04:14 PM ET (US)
For what it's worth and to add to the confusion, a Champion to NGK conversion chart provided the following matches: Champion QL77JC4 = NGK BZ7HS-10 Champion QL82YC = NGK BPR7HS (this is plug I've been using) Here's the link to the conversion chart: http://moped2.org/forum/forum_posts.asp?TID=11073 |
| makoman310 |
posted 08-08-2008 05:46 PM ET (US)
You must use QL78YC all motors from 93 on 90 to 250-HP |
| jimh |
posted 08-08-2008 11:16 PM ET (US)
His motor is a 1996, not a 1993. The spark plug application chart shows three kinds of 90-HP motors in 1996. Which one are we taking about? |
| seahorse |
posted 08-09-2008 07:56 AM ET (US)
Knowing which model 90 you have would help out here. If the engine mounted trim switch is on the PORT side, then use only the Champion QL78YC plugs gapped at .030". On a STB mounted trim switch motor, use QL82C plugs at .030"
For years OMC/BRP publishes a spark plug chart for their motors in their Parts and Accessories catalog and state that other company's cross-reference charts may not be accurate. There is a difference between resisitor plugs and the required suppressor sparkplugs, Q style, needed by J-E outboards.
|
| kend |
posted 08-09-2008 10:49 AM ET (US)
I have a 90 hp VRO and clean the plugs at least once a month or whe it becomes hard to start. I started doing this after reading of similar problems on this site of other owners with VRO. Lightly use sand paper and WD 40 the plugs, no need to buy new until they are shot. The correct plug is QL77JC4 |
| Tohsgib |
posted 08-09-2008 11:22 AM ET (US)
I bought a case of Texaco oil years back for cheap. It fouled the plugs twice in about 10-15 hours. I went back to OMC brand and never fouled another. Good oil is very important. i also like Champion plugs in OMC engines and lawnmowers. Anything else they are junk plugs. |
| whalerajm |
posted 08-10-2008 10:22 PM ET (US)
Thanks all... My trim switch is on the Port side...so per seahorse's advise I should use QL82C... Kend says QL77JC4... Others and chart say QL77JC4... NGK says their plug is OK too... I appreciate the input, but still a little uncertain if all are OK or one of the Champion plugs is best option... I'm going to dig out the manuals and see what I can find out... |
| whalerajm |
posted 08-10-2008 11:01 PM ET (US)
Found original owners manual... QL77JC4 is the winner. Guess I'll save my case of NGK's for backup. Thanks Manual also showed a flushing port! I've been flushing with muffs...never knew it had flushing port! I need to spend more time with my boat! |
| seahorse |
posted 08-11-2008 07:40 AM ET (US)
quote: You got it backwards If the engine mounted trim switch is on the PORT side, then use only the Champion QL78YC plugs gapped at .030".
quote: Your 12 year old owners manual has been out of date for at least 10 years. Look up the spark plug recommendation in the official factory spark plug chart for your 60° V-4 90hp in the following link, that was posted earlier in this thread. Also read the asterisk on the bottom of the page. www.continuouswave.com/whaler/reference/BRP_SparkPlugChart2007.pdf |
| whalerajm |
posted 08-11-2008 11:00 PM ET (US)
Seahorse, Thanks again...I'm going to quit questioning you and just use the plugs you suggest...sounds like really you know your stuff! Andy |
| |
Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.