FAQS

FAQs

What’s the difference between Apticote 2000 and other coatings?

As part of Poeton Industries, Apticote 2000 is subject to the same rigorous testing procedures as the coatings that service the aerospace market. Our processes and process chemistry are strictly maintained to provide a quality finish that delivers superior performance.

Do I need to send a piston with my cylinder?

We don’t necessarily need the piston although it would help us exactly match the bore size. If you’d rather not send the piston, we can hone to a size you indicate or to the manufacturer’s nominal bore size.

Do I need to send the piston rings?

No, we don’t need you to send us the piston rings.

How should I send the part?

Please remove all steel parts, power valves, studs etc before wrapping the cylinder in a protective material and placing it in a strong box. We recommend sending to us by Royal Mail Recorded Delivery.

How long will it take to process my cylinder?

We aim to repair all cylinders within 10 working days. If you need it sooner, use our Cylinder Express fast track service and we’ll have it back to you in 4 working days.
Please note, we can only confirm lead time once your cylinder has arrived on site and we have assessed the repair required.

Do I have to do anything to my cylinder when I get it back?

We hone all cylinders to the manufacturer’s recommendations and for all 2-stroke cylinders we’ll dress the ports and relieve the exhaust bridges. All cylinders have the top face lapped to remove any ‘flash’ of coating and so parts should be ready to fit. However, we always recommend that the engine builder follows manufacturer instructions regarding piston to bore clearances, piston ring end gaps, squish clearances, cylinder head volume and port timing in order to maintain maximum performance.

I have some scoring in the surface, will that need to be welded?

The original coating will be in the order of 0.075mm thick and if a piston ring or small end bearing has broken and been trapped between the piston and the bore it’s likely that the score will require welding. We’ll assess this once the coating has been removed and advise accordingly.

How many times can my cylinder be repaired?

This depends on the previous repairs that have been carried out. A straight forward re-plate and hone will only remove a small amount of material from the bare casting. But if a weld repair is carried out then there may be some distortion, and therefore more material has to be removed in order to get the cylinder true again. Usually cylinders can be repaired 4-5 times and after that it becomes more difficult (depending on previous repairs), but we’ve seen many cylinders that have had 8 or more repairs.

I’ve had my cylinder repaired by you but now there’s some pitting in the coating, is this normal?

Due to their very nature, the pitting is generally in the actual casting as when the original coating is chemically removed any impurities at the cylinder face will also be removed. This will often occur after welding. Pitting should not be derogatory to performance, some lower quality castings will even have pitting from new, and the pits are generally viewed as just holding oil. Unless the pitting bridges the piston ring surface, minimumblow by or compression would be lost, and in the case of a 2-stroke engine, if they are lower than the top of the exhaust port, no compression could be lost at all.

I have some damage to the top of the cylinder leading on to the cylinder head face, can this be repaired?

Yes, detonation damage is a common occurrence on a 2-stroke. We can weld the damaged area and machine back before coating with Apticote Ceramic 2000 and diamond honing to size. You should look into the original cause of this damage before racing again.

I have a crack in the exhaust port bridge can this be repaired?

Yes, many 2 strokes will crack on the exhaust port bridges. We will grind the crack back into the port, weld and repair. You need to consider why this has happened, it is more common in some models than others and is probably related to exhaust gas temperature.