DynoDon
Moderator
DCD212 TRACK OPTION CLASS
This class is designed to reach Karter‘s who choose to race on a budget. We desire to keep this class as affordable as possible in order to bring new Karters into our sport as well as maintain Karter‘s who would otherwise have to get out due to budget constraints. This class is NO WAY intended for the PRO KARTERS and should never be utilized as a “ BIG MONEY CLASS “. The 212 should be used in adult entry-level classes and entry-level restricted classes by simply using the current Red Green Purple and Blue restrictor plates. Dyno Cams also offers a 5200 rpm coil should tracks choose not to use restrictor plates.
In the following set of specs you will notice language that states “REFERENCE ONLY.” It is there because the engine is new to AKRA. We need to work with officials in the field to assist us on visuals in the areas that we have identified numbers around. If any officials in the field notice that the areas we have identified are significantly out of spec please contact Dyno Cams or myself Don Gordner immediately so that the area in question can be corrected.
Engine must be factory rated Ducar 212 cc and run in box stock configuration. All parts must be stock OEM factory production parts unless otherwise specified in the rules. No alterations, cutting, grinding or machining of any parts. No sand blasting, tumbling or polishing of any kind. This is strictly prohibited. All parts are subject to be checked by a known stock part when in question. Absolutely no reading between the lines. If it is not specifically mentioned in these rules, then it must remain stock. Should there be any doubt as to the legality of a part on the engine the competitor has the right to file a protest with the track/official. The part in question can then be shipped to Dyno cams or AKRA for a review. Please include contact information for the promoter so Dyno Cams or AKRA will be able to contact the promoter. When shipping a part or a complete engine it is imperative that the engine or parts be put in the proper box. The box then should be taped shut and signatures of the owner and the promoter or inspector be written in magic marker across the taped portion of the box.
DCD212 1: FUEL: 87 octane only.
DDC212 2: BLOCK: Stock OEM 212 Block with no machining allowed with the exception of cylinder clearance. Maximum bore size 2.758. Zero piston pop-up.
DCD212: 3: Cylinder Head: no machining permitted on gasket surface and absolutely no porting of any kind. Depth from gasket surface to floor of combustion chamber between the valves .485 +/- .010. “FOR REFERENCE ONLY”.
DCD212: 3-1: HEAD GASKET: Stock OEM graphite style head gasket only. Minimum .043 thickness. No sealer.
DCD212: 3-2: INSTALLED HEIGHT: Intake installed height .990. Exhaust installed height .885. “Reference Only”
DCD212: 3-3: VALVE GUIDE: intake length 1.160 minimum. exhaust length 1.395 minimum. Valve guide height under valve spring to be measured with a 7/16 washer. Hole in washer may need to be opened just a bit to fit over guide assembly. ( Proper tooling to be made for purchase). Washer is approximately .087 thick. Guide may not extend out of washer. “NOTE”: this check is a “REFERENCE” at this point in time. The purpose of the check is to discourage shoving the exhaust guide upwards out of the port to create a better flow.
DCD212 4-1: SEATS: The seats must remain stock and may have three angles of 30/45/60 as from the factory. However, you may not attempt to excessively sink the valves in an effort to increase airflow. Excessive cutting of the 30 or the 60 cut will be grounds for “DISQUALIFIED”
DCD212 5: VALVES: 45 degree face on both valves.
5-1: Length: Minimum length of valves 2.915. To be measured from top/head of valve to top of stem where retainer clips rest. “ For reference only “
5-2: Valve head diameter: Maximum intake head diameter 1.062 +/- .005. Maximum exhaust head diameter .946 +/- .005. “For reference only”
5-3: Oil seal: Permitted on intake side only. Rubber to remain on seal. Maximum thickness of seal .025.
5-4: SHIMS. No shims permitted.
DCD212 6: Pushrods: stock OEM push rods must be used with a maximum length of 5.825 +/- .010.
DCD212 7: lifters: Stock unaltered. .920 Head. 1.360 length. “For reference only”
DCD212 8: Spring Retainers: no light weight components. .055 lip minimum.
DCD212 9: Piston: Stock OEM dished piston with valve relief on the exhaust side only. Maximum size 2.7565 measured at the bottom of the skirt.
DCD212 10: RINGS: Stock OEM rings. No altering of the rings permitted especially the oil ring. End gap of top and middle ring not to exceed .030.
DCD212 11: CONNECTING ROD: Stock unaltered Rod. Rod may be honed for oil Clarence. No rounded or broken edges. No billet rods.
DCD212 12: CRANKSHAFT: Stock unaltered. Governor gear must be installed in stock location. Max stroke 2.163+/- .010.
DCD212 13: FLYWHEEL: PVL aluminum diecast flywheel only. No cast iron flywheels. Must utilize stock unaltered timing key. Stock OEM unaltered ignition coil. Timing to be tested at 26 or 27 degrees
13-1: Rev limited coil. 5200 rpm. Governor may be removed
DCD212 14: GOVERNOR: governor gear arm and linkage must remain intact and functional if not using rev limiting coil. Track may require engine to be free revved on the stand to a certain rpm to determine if the governor is properly functioning. It has been our findings that some engines surge and some will not. We do not require the surge because in stock form the engine will perform best at 5000 RPM or less. However RPM requirements will be left entirely up to race promoters.
DCD212 15: CAMSHAFT: Stock OEM cam only.
15-1: Base Circle: .865 + .010 / -.005
15-2: Max Lift: Intake: .225 Exhaust: .232
15-3: DURATION: Intake: @ .050 = 210 @ .200 = 75 Exhaust: @ .050 = 212 @ .200 = 84
15-3-1: ALL CHECKS At PUSH ROD
DCD212 16: ROCKER ARM: Must remain as supplied from factory. Absolutely no alterations or machining permitted.
DCD212 17: SPRINGS: Wire diameter .079 maximum. Uninstalled height 1.383 maximum.
DCD212. 18: CARBURETOR: Stock OEM Ruixing carburetor only.
“NOTE”: May be checked with clone tooling and rules
18-1: Venturi: .615 maximum and .608 minimum.
18-2: E-tube: Stock E-tube with with maximum of 20 holes. Maximum center hole .066. Minimum length 1.092.
18-3: Butterfly: .037 minimum
18-4: Throttle shaft: .115 minimum18-5: Throttle-shaft screw: .305
18-6: Carb bore: .750
18-7: Phenolic spacer: must remain stock as produced
18-8: Jetting: Pilot - .019 no go both o rings present
Main - .030 no go
18-9: Gaskets: Clone metal gasket with rubber attached may be used instead of “thin” paper gasket at choke end.
DCD212 19: AIR BOX: Stock OEM airbox must be used and in stock unaltered form only. Air must enter through the air filter only. Any open unused holes must be plugged. Stock OEM air filter with foam sock must be used.
DCD212 20: MUFFLER: Stock OEM muffler in unaltered form must be used. If any doubts about the integrity of the muffler should arise simply cut the muffler in half to determine legality by comparing it to a known stock muffler.
DCD212 21: FUEL TANK: stock tank should be removed and an auxiliary tank mounted on the floor pan should be used. A top plate and fuel pump are permitted with the pump to be pulsed off the valve cover only.
If track option is to retain the fuel tank up to 4 1/8 inch holes in the fuel cap for venting is permitted. Vent tube may be unplugged.
NOTES: Low oil shut off may be disconnected no taping or decals added to the recoil in any attempt to block off air.
No engine builder advertisement permitted on the engine.
Chain guard throttle linkage top plate and fuel pump are the only aftermarket parts permitted on the engine.
There is no claimer rule. The engine in question must be protesting by competitor or subject to tech by the track if the promoter or tech deems necessary. The protest and acceptance fees are to be determined by the track.
Should there be any doubt as to the legality of any part on the DuCar 212 engine the competitor has the right to file a protest with the track officials. The part in question may then be shipped to Dyno cams or AKRA for a review. Please include the contact information for the promoter so contact can be made to discuss the situation. When shipping Parts be sure to tape the box securely and signatures of the owner and the tech inspector and the promotor must be signed over the tape with a magic marker.
This class is designed to reach Karter‘s who choose to race on a budget. We desire to keep this class as affordable as possible in order to bring new Karters into our sport as well as maintain Karter‘s who would otherwise have to get out due to budget constraints. This class is NO WAY intended for the PRO KARTERS and should never be utilized as a “ BIG MONEY CLASS “. The 212 should be used in adult entry-level classes and entry-level restricted classes by simply using the current Red Green Purple and Blue restrictor plates. Dyno Cams also offers a 5200 rpm coil should tracks choose not to use restrictor plates.
In the following set of specs you will notice language that states “REFERENCE ONLY.” It is there because the engine is new to AKRA. We need to work with officials in the field to assist us on visuals in the areas that we have identified numbers around. If any officials in the field notice that the areas we have identified are significantly out of spec please contact Dyno Cams or myself Don Gordner immediately so that the area in question can be corrected.
Engine must be factory rated Ducar 212 cc and run in box stock configuration. All parts must be stock OEM factory production parts unless otherwise specified in the rules. No alterations, cutting, grinding or machining of any parts. No sand blasting, tumbling or polishing of any kind. This is strictly prohibited. All parts are subject to be checked by a known stock part when in question. Absolutely no reading between the lines. If it is not specifically mentioned in these rules, then it must remain stock. Should there be any doubt as to the legality of a part on the engine the competitor has the right to file a protest with the track/official. The part in question can then be shipped to Dyno cams or AKRA for a review. Please include contact information for the promoter so Dyno Cams or AKRA will be able to contact the promoter. When shipping a part or a complete engine it is imperative that the engine or parts be put in the proper box. The box then should be taped shut and signatures of the owner and the promoter or inspector be written in magic marker across the taped portion of the box.
DCD212 1: FUEL: 87 octane only.
DDC212 2: BLOCK: Stock OEM 212 Block with no machining allowed with the exception of cylinder clearance. Maximum bore size 2.758. Zero piston pop-up.
DCD212: 3: Cylinder Head: no machining permitted on gasket surface and absolutely no porting of any kind. Depth from gasket surface to floor of combustion chamber between the valves .485 +/- .010. “FOR REFERENCE ONLY”.
DCD212: 3-1: HEAD GASKET: Stock OEM graphite style head gasket only. Minimum .043 thickness. No sealer.
DCD212: 3-2: INSTALLED HEIGHT: Intake installed height .990. Exhaust installed height .885. “Reference Only”
DCD212: 3-3: VALVE GUIDE: intake length 1.160 minimum. exhaust length 1.395 minimum. Valve guide height under valve spring to be measured with a 7/16 washer. Hole in washer may need to be opened just a bit to fit over guide assembly. ( Proper tooling to be made for purchase). Washer is approximately .087 thick. Guide may not extend out of washer. “NOTE”: this check is a “REFERENCE” at this point in time. The purpose of the check is to discourage shoving the exhaust guide upwards out of the port to create a better flow.
DCD212 4-1: SEATS: The seats must remain stock and may have three angles of 30/45/60 as from the factory. However, you may not attempt to excessively sink the valves in an effort to increase airflow. Excessive cutting of the 30 or the 60 cut will be grounds for “DISQUALIFIED”
DCD212 5: VALVES: 45 degree face on both valves.
5-1: Length: Minimum length of valves 2.915. To be measured from top/head of valve to top of stem where retainer clips rest. “ For reference only “
5-2: Valve head diameter: Maximum intake head diameter 1.062 +/- .005. Maximum exhaust head diameter .946 +/- .005. “For reference only”
5-3: Oil seal: Permitted on intake side only. Rubber to remain on seal. Maximum thickness of seal .025.
5-4: SHIMS. No shims permitted.
DCD212 6: Pushrods: stock OEM push rods must be used with a maximum length of 5.825 +/- .010.
DCD212 7: lifters: Stock unaltered. .920 Head. 1.360 length. “For reference only”
DCD212 8: Spring Retainers: no light weight components. .055 lip minimum.
DCD212 9: Piston: Stock OEM dished piston with valve relief on the exhaust side only. Maximum size 2.7565 measured at the bottom of the skirt.
DCD212 10: RINGS: Stock OEM rings. No altering of the rings permitted especially the oil ring. End gap of top and middle ring not to exceed .030.
DCD212 11: CONNECTING ROD: Stock unaltered Rod. Rod may be honed for oil Clarence. No rounded or broken edges. No billet rods.
DCD212 12: CRANKSHAFT: Stock unaltered. Governor gear must be installed in stock location. Max stroke 2.163+/- .010.
DCD212 13: FLYWHEEL: PVL aluminum diecast flywheel only. No cast iron flywheels. Must utilize stock unaltered timing key. Stock OEM unaltered ignition coil. Timing to be tested at 26 or 27 degrees
13-1: Rev limited coil. 5200 rpm. Governor may be removed
DCD212 14: GOVERNOR: governor gear arm and linkage must remain intact and functional if not using rev limiting coil. Track may require engine to be free revved on the stand to a certain rpm to determine if the governor is properly functioning. It has been our findings that some engines surge and some will not. We do not require the surge because in stock form the engine will perform best at 5000 RPM or less. However RPM requirements will be left entirely up to race promoters.
DCD212 15: CAMSHAFT: Stock OEM cam only.
15-1: Base Circle: .865 + .010 / -.005
15-2: Max Lift: Intake: .225 Exhaust: .232
15-3: DURATION: Intake: @ .050 = 210 @ .200 = 75 Exhaust: @ .050 = 212 @ .200 = 84
15-3-1: ALL CHECKS At PUSH ROD
DCD212 16: ROCKER ARM: Must remain as supplied from factory. Absolutely no alterations or machining permitted.
DCD212 17: SPRINGS: Wire diameter .079 maximum. Uninstalled height 1.383 maximum.
DCD212. 18: CARBURETOR: Stock OEM Ruixing carburetor only.
“NOTE”: May be checked with clone tooling and rules
18-1: Venturi: .615 maximum and .608 minimum.
18-2: E-tube: Stock E-tube with with maximum of 20 holes. Maximum center hole .066. Minimum length 1.092.
18-3: Butterfly: .037 minimum
18-4: Throttle shaft: .115 minimum18-5: Throttle-shaft screw: .305
18-6: Carb bore: .750
18-7: Phenolic spacer: must remain stock as produced
18-8: Jetting: Pilot - .019 no go both o rings present
Main - .030 no go
18-9: Gaskets: Clone metal gasket with rubber attached may be used instead of “thin” paper gasket at choke end.
DCD212 19: AIR BOX: Stock OEM airbox must be used and in stock unaltered form only. Air must enter through the air filter only. Any open unused holes must be plugged. Stock OEM air filter with foam sock must be used.
DCD212 20: MUFFLER: Stock OEM muffler in unaltered form must be used. If any doubts about the integrity of the muffler should arise simply cut the muffler in half to determine legality by comparing it to a known stock muffler.
DCD212 21: FUEL TANK: stock tank should be removed and an auxiliary tank mounted on the floor pan should be used. A top plate and fuel pump are permitted with the pump to be pulsed off the valve cover only.
If track option is to retain the fuel tank up to 4 1/8 inch holes in the fuel cap for venting is permitted. Vent tube may be unplugged.
NOTES: Low oil shut off may be disconnected no taping or decals added to the recoil in any attempt to block off air.
No engine builder advertisement permitted on the engine.
Chain guard throttle linkage top plate and fuel pump are the only aftermarket parts permitted on the engine.
There is no claimer rule. The engine in question must be protesting by competitor or subject to tech by the track if the promoter or tech deems necessary. The protest and acceptance fees are to be determined by the track.
Should there be any doubt as to the legality of any part on the DuCar 212 engine the competitor has the right to file a protest with the track officials. The part in question may then be shipped to Dyno cams or AKRA for a review. Please include the contact information for the promoter so contact can be made to discuss the situation. When shipping Parts be sure to tape the box securely and signatures of the owner and the tech inspector and the promotor must be signed over the tape with a magic marker.
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