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⚡ Ignite your ride with Bosch’s double iridium spark—where power meets precision!
The Bosch 9603 Original Equipment Fine Wire Iridium Spark Plug is engineered for motorcycles, featuring a double iridium core that delivers up to 4 times longer life than standard plugs. Designed with a 14mm thread size and lightweight construction, it ensures a perfect fit and reliable ignition performance, backed by Bosch’s trusted OE technology and a 4.6-star rating from over 800 users.
| ASIN | B00515NH4K |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #111,933 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #581 in Ignitions |
| Brand | Bosch |
| Brand Name | Bosch |
| Compatible with Vehicle Type | Motorcycle |
| Core Material | Iridium |
| Customer Reviews | 4.6 out of 5 stars 836 Reviews |
| Global Trade Identification Number | 00028851010375 |
| Item Weight | 23 g |
| Manufacturer Part Number | 9603 |
| Model | 9603_1 |
| OEM Equivalent Part Number | 9603 |
| Thread Size | 14mm |
| Top Material Type | Nickel |
| UPC | 028851010375 |
| Vehicle Service Type | Motorcycle |
B**D
Very nice
Nice product
S**K
Ok
Ok
A**.
Compatibility of products as mentioned.
Details of product’s compatibility specially in accessories & parts is very bad. As these products are only exchangeable it’s a loss of the client. But somehow when I have expressed my issues either the product has been changed or I have been refunded.
A**R
Run great
Toyota Sienna 2006
C**A
Reliable Bosch Spark Plugs
High-quality spark plugs that fit perfectly and work as expected. Engine runs smoother and starts easily. Durable and dependable — Bosch never disappoints. Great value for maintenance or replacement!
S**N
Solid, reliable park plugs
I got these for my 2002 GS430 and boy do they help get all the power out of my engine. I have an exhaust leak and trans leak that leads to a laggy bogged down performance, but by swapping out with these plugs yearly I can keep the power more responsive. I tried other plugs, but these seem to do the best for me in my case. Installation was straight forward and these tightened in place great with a little bit of antiseize.
Q**Q
Good performance and better gas mileage.
The plugs I received were made in Germany. The plugs are almost half the cost of Denso and they perform just as well. I would recommend these plugs.
W**?
Use spark plugs? C’mon Amazon
Bought these for my 2003 Thunderbird. All of them were used spark plugs. Useless waste of time. Now I have to return them and go through the pain of re-installing the coil covers and repeating the process all over again.
Trustpilot
2 weeks ago
2 weeks ago