Gunson Motorcycle Colortune Kit 10-12mm
14-day returns on all eligible orders
Contact us within 14 days of receiving your order to request a return.
Shipping information
Orders are picked, packed and dispatched from our Northampton warehouse.
- Free delivery to mainland UK addresses on orders of £40 or more.
- Orders under £40, and orders to Northern Ireland, have a delivery charge, shown at checkout before you pay.
- You will get an email with your tracking number once your order has shipped.
Full details are in our Shipping Policy.
Returns & warranty
Changed your mind? You can return an online order within 14 days of receiving it. Please contact us first for return instructions, then you have 14 days to send the goods back.
- Items must be unused, complete and in their original condition, with all accessories, instructions and original packaging.
- You arrange and pay for the return postage on change-of-mind returns. We refund the price of the item plus our standard delivery charge.
- Damaged in transit? Let us know within 48 hours of delivery - photos help.
- Faulty or wrong item? Contact us before sending anything back. Faulty goods are covered by your statutory rights.
Your statutory rights are not affected. Full details are in our Refund Policy, or email onlinesales@nn4online.co.uk.
Specially designed for motorcycle engines, this low-volume Colortune maintains the engine’s compression ratio, ensuring better firing of the mixture. Simple to use, the Colortune spark plug features a glass insulator viewing window, making the combustion flame visible. The kit also includes a view scope with an adjustable mirror, allowing the flame to be seen where engine access is restricted. The flame colour inside the cylinder shows the richness of the air-fuel ratio: a yellow flame indicates a rich mixture, a bluish-white flame a weak mixture, while a Bunsen blue flame is usually correct. By adjusting the mixture screw to achieve the correct flame colour, the engine can be tuned accurately. This Gunson Colortune kit for motorcycles is designed for use with a 10mm spark plug size.
Features
- Colortune features a viewing window so the air:fuel ratio can be adjusted according to flame colour. Ideal for simple and effective engine tuning.
- Colortune will fit most motorcycle engines fitted with M10 threaded plugs.
- Kit includes: 10mm plug, hexagonal adaptor, angled cleaning brush & instructions.
- Replacement HT lead adaptor available, Part No. G4074/02.
- Also available to fit motorcycles fitted with M12 threaded plugs, please see Gunson Part No. G4171.
Available in 2 length options 10 and 12 — use the selector above to pick the exact one for the job.
Available lengths
| Length | EAN |
|---|---|
| 10 | 5018341741723 |
| 12 | 5018341741716 |
Use the length selector at the top of this page to choose your option. Each option is dispatched as a separate stocked item.
Specifications
| Brand | Gunson |
| EAN | 5018341741723 |
| Type | Colortune |
| Item Weight | 0.155 kg |
| Custom Bundle | No |
| Item Width | 118mm |
| Item Height | 31mm |
| Item Depth | 265mm |
| Country/Region of Manufacture | Great Britain |
| Customs Tariff Number | 90278990 |
| Sub-Type | GENG |
| Length | 12mm |
| Manufacturer Part Number (MPN) | GPL |