M.A.P. Cycle Billet Piston Kits for M.A.P. Cycle Billet Piston Kits for OEM (71mm bore) cylinders. Not for aftermarket big bore cylinders.
- Hi-Silicone, low expansion, Hi-Strength 4032 aluminum alloy. The ultimate for severe use in air cooled engines.
- 100% CNC Machined, utilizing the latest “Solid Works” CAD design. This allows for consistent cross-section providing the most even heat distribution with the highest weight reduction (lightest commercially available piston kits for less vibration).
- Lo-Dome "Tight Quench" design for efficient flame travel and combustion (9.5:1 compression ratio and higher)
- Zero Deck design for max power while minimizing octane requirements (9.5:1 compression ratio and higher)
- 2nd Ring-Land "Accumulator" groove to prevent unloading of the top ring from trapped blow-by.
- Tapered wrist pin (I.D.) for rigidity and weight reduction
- “Micro Groove" piston skirt for high scuff resistance.
- Race Type "SpiroLoc" clips for reliability - Won't come out
- Latest piston cam design reduces noise, and increases life better than any other commercially available vintage Brit Bike piston kit.
- 4 location pressure fed wrist pin oilers
- Increases oil volume to pin
- Dual clocked pin bore grooving holds and disperses the oil around the wrist pin
- Minimizes heat buildup to prevent galling between the small end of the rod and the wrist pin
- Perfectly round making these the best sealing, quickest seating rings available.
- Modern sizing for the least amount of friction with the most amount of heat transfer for cooler running pistons.
- 1.0mm Nitrided Stainless Steel Barrel-Face Top Ring
- 1.2mm Ferrox Cast-Iron Napier 2nd
- 2.8mm Nitrided Stainless Steel Rails with expander (3 piece design)
Updated wrist pin oiling:
Race proven ring pack features:
Note: Stated compression ratios are an approximation, and are dependent on several variables such as base and head gasket thickness, and any modifications that changes combustion chamber volume such as valve recession, valve sizing, and head surface milling.
Designed by, and exclusively manufactured for M.A.P. Cycle thru sources in the U.S.A.
SKU MAP9006A-9008A-BILLET Piston Material Billet - 4032
- Additional Information
SKU MAP9006A-9008A-BILLET Piston Material Billet - 4032
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- Product Question
Product QuestionsAre these piston sets OK to use in my 1959 Triumph T110, 650cc.
What are the oversize increments and also what is the freight cost to New Zealand.
Thanks for your assistance.
Graham.Question by: Graham Fairbrother. on Feb 8, 2018 10:18:00 PMGraham,
I was able to catch the owner before he left. He said as long as you have a 71mm stock bore on your 650, these pistons will work great. I suggest the 7.5:1 compression ratio. The bore sizes we offer are 71, 71.5, 72 and 72.5.
To find the shipping cost to NZ, just go to the listing, click on the SHIPPING ESTIMATION tab and fill in your address. When you click on GET RATES you will be given several options. Our new FedEX rates are really good and you'll have your package in just a few days. Don't forget most countries impose some sort of import tax, though usually not too much. We don't know the the rate in NZ. Below is a link to the pistons. Please let us know if you have any other questions.
Answer by: rick c (Admin) on Feb 9, 2018 1:01:00 PMTo whom it may concern,
I have a Triumph TR6 1978 Model. 9.1 comp ratio
I need .020"os Pistons,your site doesn,t allow to order os" can you or do you supply os" also i need Gudgeon pin bushes,gaskets, Inlet & Exh valves can you supply these as well. Also you say to order one, is it one piston or 1pair?
AndyQuestion by: Andy Cartwright on Jun 5, 2018 4:32:00 AMLike many other sellers of pistons and rings, we no longer sell these items in the traditional inch measurement. The piston ring world has gone metric (they've actually been there a while), and to get the best possible rings for our customers, we need to sell in metric sizes.
We only sell these pistons by bore size, so if you're not a machinist, you'll need to have one examine your cylinder and determine what the correct bore should be for your barrel.
Also, our billet pistons only come in 7.5:1, 9.5:1 and 10.5:1. We do not have 9:1.
The good news is, while they may not be in inch, these are the most advanced pistons sold anywhere for a 4-stroke motorcycle and they're well worth any extra effort.
These pistons come with top quality pins and clips. The pistons, rings, pin and clips are sold as a set for both cylinders. We do not sell them individually. We do have valves depending on what you need. I highly suggest Black Diamond valves by Kibblewhite:
Valves are sold individually. Please be sure to measure your valves to be sure they're stock and not oversize. We also carry all the gaskets you need.
Answer by: rick c (Admin) on Jun 5, 2018 10:20:00 AMFor the original cast pistons I've been accustomed to leaving about .045-.060" of clearance to the cylinder wall. What kind of clearance would you recommend for your billet piston sets?Question by: Mike on Nov 21, 2017 4:08:00 PMClearance depends on the cylinder (as well as other factors - street use vs racing, etc.). With the iron barrel, usually anywhere from .0035-.005 is good
With cast iron, aluminum-sleeved barrel use .002-.004 (measured about .200 above the bottom of the skirt, 90-degrees to the pin at 74-degrees F.)
It's really important not to use wide open throttle during break in and use quality, high grade fuel to avoid detonation during this time as well. Also, make sure you timing is spot on! A good digital electronic ignition like our Tri-Spark set up is great because it will give you a fixed point on the advanced curve where the ignition will stop advancing. Most analog ignitions will not.
For racing, add .0005-.001 to these dimensions.Answer by: rick c (Admin) on Nov 22, 2017 8:54:00 AM
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