Genuine NGK Spark Plug Harley Davidson FLH FLHR FX FXE FXEF FXS 1979
NGK Genuine Motorcycle Spark Plug to fit Harley Davidson FLH FLHR FX FXE FXEF FXS years 75-81
NGK is the leader in Motorcycle Spark Plugs, with spark plugs for virtually every Motorcycle, ATV, and Scooter application in the world. Utilizing a wide variety of materials, from standard copper-core type to Iridium, NGK is the world's leader in spark plug engineering and technology.
NGK Spark Plugs are:
- OEM Approved
- Specified by more motorcycle manufacturers, including Honda, Kawasaki, KTM, Suzuki, and Yamaha, than any other spark plug company
571840
Spark Plug Installation
Installing the incorrect spark plug can cause serious damage to your bike.
Spark plugs are designed to operate at an optimal operating temperature and correct tightening is critical to the operation of a spark plug. The following two major problems commonly occur if the incorrect torque is applied:
- Excessive Tightening > Thread breakage
- Insufficient Tightening > Overheating
Installation Instructions for new Spark Plug:
- Check gap on every plug prior to installation. Set gap size to engine manufacturer’s recommendation.
- Confirm that the thread reach of the spark plug is the right one for the engine.
- Remove any dirt at the gasket seat of the cylinder head.
- Tighten the spark plug finger tight first until the gasket reaches the cylinder head, then screw about ½ - ¾ turn more with a plug wrench. (Conical seat; about 1/16 turn more). Refer to diagrams below.
- If using a torque wrench, please refer to the table below.
- Always remove and install spark plugs when the engine is cool.
|
Spark Plug Type (thread diameter) |
Cast Iron |
Aluminium |
|
|
Flat Seat Type (with gasket) |
18mmØ |
3.5 ~ 4.5 kg-m |
3.5 ~ 4.0 kg-m |
|
(25.3 ~ 32.5 lb-ft) |
(25.3 ~ 32.5 lb-ft) |
||
|
14mmØ |
2.5 ~ 3.5 kg-m |
2.5 ~ 3.0 kg-m |
|
|
(18.0 ~ 25.3 lb-ft) |
(18.0 ~ 21.6 lb-ft) |
||
|
12mmØ |
1.5 ~ 2.5 kg-m |
1.5 ~ 2.0 kg-m |
|
|
(10.8 ~ 18.0 lb-ft) |
(10.8 ~ 14.5 lb-ft) |
||
|
10mmØ |
1.0 ~ 1.5 kg-m |
1.0 ~ 1.2 kg-m |
|
|
(7.2 ~ 10.8 lb-ft) |
(7.2 ~ 8.7 lb-ft) |
||
|
Conical Seat Type (without gasket) |
18mmØ |
2.0 ~ 3.0 kg-m |
2.0 ~ 3.0 kg-m |
|
(14.5 ~ 21.6 lb-ft) |
(14.5 ~ 21.6 lb-ft) |
||
|
14mmØ |
1.5 ~ 2.5 kg-m |
1.0 ~ 2.0 kg-m |
|
|
(10.8 ~ 18.0 lb-ft) |
(7.2 ~ 14.5 lb-ft) |
||
Torque is one of the most critical aspects of spark plug installation. Torque directly affects the spark plugs' ability to transfer heat out of the combustion chamber. A spark plug that is under-torqued will not be fully seated on the cylinder head, hence heat transfer will be slowed. This will tend to elevate combustion chamber temperatures to unsafe levels, and pre-ignition and detonation will usually follow. Serious engine damage is not far behind.
An over-torqued spark plug can suffer from severe stress to the Metal Shell which in turn can distort the spark plug's inner gas seals or even cause a hairline fracture to the spark plug's insulator, in either case, heat transfer can again be slowed and the above mentioned conditions can occur.
The spark plug holes must always be cleaned prior to installation, otherwise you may be torquing against dirt or debris and the spark plug may actually end up under-torqued, even though your torque wrench says otherwise. Of course, you should only install spark plugs in a cool engine, because metal expands when its hot and installation may prove difficult. Proper torque specs for both aluminium and cast iron cylinder heads are listed below.
Your item will be professionally & carefully packed and despatched in a timely manner.
All orders will normally be posted within 1 to 2 business days after confirmation and verification of your payment information. Orders are not usually processed for shipment on weekends and bank holidays.
Please refer to the top of the listing for postage options and charges. We regret that we are only able to offer shipping to mainland UK at this time.
We want you to be happy with your purchase from Busters Accessories however there may be certain instances products may need to be returned.
If you change your mind
If you have simply changed your mind about any item ordered and you wish to return it, then you can do so provided you inform us of your decision within 30 days of receipt. All you will be responsible for is the cost of the return postage. The item should be unworn, undamaged and must be 'as new' when returned to us. We will issue an exchange or refund to you via your original payment method.
Transit
If any items were damaged in transit, we ask that you report it to us within 7 working days on their return they can be replaced or a refunded issued via your original payment method.
Faulty on Arrival
If your items are faulty on arrival, you should inform us as soon as reasonably possible. Items should be returned in their original packaging when possible with a copy of original documentation. Once we have verified the fault, we will issue a replacement or full refund to you via your original payment method.
Items Faulty in Warranty Period
If any of your purchases develop a fault within its warranty period it will need to be returned. Once the fault has been verified, a repair or exchange of goods will be issued.
Notes
- Customer services can be contacted through eBay.
- Returns take approximately five business days to process upon receipt of the item.
- We are not responsible for the loss or damage of items during their return.
- Buyer is responsible for any shipping charges when returning the item.
Return address
Busters Accessories
Phoenix Way Garngoch Industrial Estate
Gorseinon
Swansea
United Kingdom
SA4 9HN
Got a question? We're here to help. Our customer service hours are 9am to 5pm Monday to Friday, excluding bank holidays.
Welcome to our eBay shop. Busters Motorcycle Accessories, one of the largest online retailers of motorcycle clothing, parts & accessories in Europe. Founded in 2000, we have attracted some of the most experienced mail order, distribution & motorcycle accessory personnel in the business. You can trust us to get your order right first time & on time.
