Yamaha made a second generation minarelli short engine, we call it the 5bm, 1st gen was 3kj. The two young italian engineers produced 125 to 250cc motorcycle engines for other makers. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a twostroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. These can be started using either electric or the kick start method. Two stroke performance tuning a disc partially cut away and attached to the end of the crankshaft opens and closes an inlet port in the side of the crankcase. In software engineering, porting is the process of adapting software for the purpose of achieving some form of execution in a computing environment that is different from the one that a given program meant for such execution was originally designed for e. The p6 minarelli engine comes a little cheaper and was offered in.
I have a macal, with a 50cc that is capable of over 125 kilhr or 80 milhr, then with a 75cc engine i am able to achieve speeds of 140 kilhr or just under. It is well made, performs good, and is easy to work on. The company continued to grow and in 1967 changed its name to motori minarelli and opened a new plant in lippo di calderara di reno. Buy carburetor carb for 50cc 2 stroke minarelli jog qj engine scooter. With 4 stroke engines, porting, when performed correctly and with the right tools, will result in positive horsepower gains, along with increased fuel efficiency and a smoother running engine. Start by removing the crankcase cover, this is on the left hand side of your engine where the kickstart is usually found. Minarelli was founded in bologna in 1951 as a motorcycle manufacturer. Magnetos minarelli electrical system theory of operations.
It features a full aluminium chassis that makes the bike unbeatable in the corners for its class. Many minarelli engine parts can be interchanged with morini franco motori engine parts due to the extreme similarities in design and construction. Motori minarelli 10 millionth engine yamaha r125 worldwide. If you are more interested in port matching the cases to your cylinder, check out this thread instead. Rating is available when the video has been rented. Port matching, porting and trenching twostroke engine. Dyno curve below shows an excellent peak power of 17. This video shows the process and results of cylinder porting on my 49cc minarelli jog 2t scooter.
On my motor 50mm stroke, 83 degree exhaust port, 119 degree. If the minarelli cylinder worked well with minimal work, id probably not. Our example has an after market 50cc performance cylinder with a bridged exhaust port. Those of us who have grown up in the japanese twostroke. Gear lever alloy aprilia rs50 and minarelli am6 en. The aprilia rs 50cc is a miniture gp bike for the road. Assemble the stator plate, making sure to align the mark you made on the stator with the same mark you made on the case. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to design and are made for maximum durability hence the thickness of the walls. Made in taiwan this product is intended for offroad, nonstreet, or to be used on racing vehicles on closed courses only. A was an italian company founded in the 1950s that produced small engines.
With 2 stroke engine modification, porting and polishing is the ultimate choice. Minarelli v1 engine case allen bolt hardware kit complete set of allen head bolts, nuts and washers to rebuild a minarelli v1 engine. I just got a lambretta due50 adly panther 50 2t knock off with the minarelli style 50cc horizontal cylinder ac engine. Also, the anti tamper torx screws that are holding the intake manifold on, he used an irwin to remove one of them, but suggested i will need to use a chisel to remove the other one. Our 50cc long case 2stroke 1pe40qmb minarelli yamaha jog style scooter engine is a high quality replacement engine that will fit on many popular scooter models. An engine from an kreidler rs 5 speed, which was sold in large quantities, can be turned into a strong 12 hp weekend warrior, using readily available parts. There is really not a restriction that can just be pulled out except a washer in the cvt. You may still need to adjust your point gap andor stator position to get the engine timed correctly.
Complete motor with 2 barrells, 1 piston ported and the other reed induction. A head can be engineered for maximum power, or for. Port matching and porting or trenching the cases for my big bore stroker 103cc minarelli engine and discussing the process and information about it. User manuals, minarelli engine operating guides and service manuals. Carburetor carb for 50cc 2 stroke minarelli jog qj engine scooter. Mmg cylinder kit 70cc 10mm pin 2 stroke jog yamaha minarelli.
The software does complete cycle simulation of the whole internal combustion process including the gasdynamics in the pipesducts, ports and plenums air boxes, boost bottles, exhaust boxes etc. Cylinder head porting refers to the process of modifying the intake and exhaust ports of an. The piston crown opens and closes the exhaust and transfer ports. Softengine engine simulation software 2tbase seven software. This programmme calculates the specific timeflowarea and specific blowdown timeflowarea for the exhaust port of an engine, based on actual flowbench data. This is your onestop place to get the crank bearings, drive shaft bearing, and all the oil seals for your minarelli v1.
The yamaha 3kj jog minarelli 1pe40qmb 1e40qmb qj50 50cc 2stroke engine is a horizontal, singlecylinder, 2 stoke, forced air engine. Porting an engine the inlet and outlet ports on the engine block are usually larger than those of the manifolds that connect to them. Many things will affect the power delivery of twostroke motorcycle engines. Carburetor carb for 50cc 2 stroke minarelli jog qj engine. Table 4 table 5 section 3 table 7 uosch model kb6b212 cev 6876 cev 6932 carburetor carburetor dismantling minarelli theory. Minarelli is an italian motorcycle engine manufacturer which was founded by vittorio minarelli. Motori minarelli is still in existence, the aprilia rs50, the macal us the minarelli am6 engine. Apr 30, 2006 yamaha made a second generation minarelli short engine, we call it the 5bm, 1st gen was 3kj. In the design form first select the water cooled and reed induction options. Later, around 1966 they made the complete motorcycles, the engines were all two stroke 66cc, 100cc, 125cc, 175cc, 200cc, 250cc, and there was a two cylinder 350 that was originally the jawa 350 with a good suspension and larger heads.
We tested that it shifts through all four gears and the kickstart works. Gy6 2 stroke carburetor for yamaha jog 50cc scooter. This is your approximate reference point for timing your engine. The deal could also include the 50cc minarelli engine if i wanted, the choice was up to me. One is located on the exhaust system and the other in the variator.
Minarelli engine quantity description cylinder, g38. Membraan kreidler van schriertuning pagina 4 maartens. An engine port is an open window in the cylinder wall for the intake or exhaust of fuel mixture airgas. There is one or more forwardlocated exhaust ports, two or more side transfer ports, and one rear intake port. The minarelli design is highly rated by many scooter enthusiasts for its excellent 2stroke design.
The restriction located in the variator is very easy to remove however you will need a lock tool or impact gun in order to remove the nut that holds it all in place. Carburetors free delivery possible on eligible purchases. Minarelli engine quantity description cylinder, cast iron, and z10 engine gasket for cylinder head std o engine head spark plug, bosch w 145 ti or cover far spark plug, rubber down 6 x for cylinder head chamfered nue for 202 t, 6 ma x 6mrn side carburetor manifold o12rnrn for. Rs 50 minarelli am6 parts the aprilia rs 50cc is a miniture gp bike for the road. What is cylinder head porting, and how does it increase. Replace the bearings and seals when you are rebuilding, porting, and generally bringing your motor back to life.
Minarelli stroker engine info and a homemade case cutting. Minarelli style horizontal cylinder 50cc air cooled. Minarelli v 1 engine models minarclli vi engine clutches for minarelli vi engine dealer tool kits for minarelli engines. I really dont know of any freeware enginedesign software, but there was a freeware. Mar 09, 2008 i just got a lambretta due50 adly panther 50 2t knock off with the minarelli style 50cc horizontal cylinder ac engine.
For sale aprilia rs50 engine it turns over with as seen in photosspares or repairs onlywas fully running many many years ago but removed due to upgradenow rare to findreceipt given. Am6 engine for sale in uk 59 secondhand am6 engines. The morbidelli 125 twin road racer is a rotary valve engine. One section is dedicated to the celebration of the production of tenmillionth engine, a prestigious milestone achieved last april 11. What this all leads to is a fairly rough cylinder head, affecting the fluid flow as it makes its way through the side of the cylinder head and into the cylinders via the valve throat. The minarelli v1 engine is used on many mopeds, such as cimatti, gitane, testi, concord, motron, fantic, general, amf, baretta, gadabout, motomarina, and safari. Moto fbm fabbrica bolognese motocicli 224 via battindarno, bologna, italy was founded 1951 by vittorio minarelli and franco morini, nephew of alphonso morini. Project 49 cylinder porting and adjustments minarelli two stroke. The term is also used when software hardware is changed to make them usable. Nice to see you made a boosterport and how you made 2 holes in the. Motori minarelli crosses an ambitious line of its longtime activity with the production of the 10 millionth engine. In 1956 minarelli switched to exclusively manufacturing twostroke engines, in a 2000 square metre purposebuilt factory. I weight 229 pounds and can only get to about 37mph on a flat surface. But the minarelli engine had the rotary valve on the side of the primary drive so you had to take off the clutch and primary cover when experimenting with valve timing, which i didnt like so much.
Were assuming that if youre buying this, you know what youre doing. Pipes, silencers, carburetors, reeds and valves are all popular bolton modifications. The event is celebrated in the production site in calderara di reno bo, in front of all the workforce, with the participation of the president of yamaha motor company, t. This software can compare up to 6 power and torque curves simultaneously. Cc specialty tools porting and polishing for 2 stroke engines. Some varieties of the minarelli engines, which are equally awesome. Oem minarelli tooth front sprocket, this is the sprocket you need for maximum blasting. Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve quantity of the air flow. You will need to file just a bit of case away to make some chains fit. The carabela factory in mexico city started making bikes around 1960 using minarelli engines, 50 cc, 100 cc. The origin of motori minarelli dates back to 1951, when vittorio minarelli and franco morini founded a company named fabbrica bolognese motori f. The company continued to grow and in 1967 changed its name to motori minarelli and opened a. The p6 minarelli engine comes a little cheaper and was offered in a wide range of mopeds.
There are two restrictions used on scooters fitted with the minarelli 50cc engine. Intake by piston port and by rotary valve systems is also included in the program. This allows for scope in the manufacturing process to allow for mismatched alignment. Setting 2t port timing wdegree wheel motorcycle engineering. Parts for these bikes are easily attainable either in race form from polini or other brands. The combination of cnc and cam software give the porter full control over the port shape and surface finish. This thread contains multiple sections about porting horizontal minarelli twostroke 1e40qmb, yamaha jogzuma, polaris 5090cc youth atvs crankcases carters. Two stroke cylinder porting tips watch this before you. Its enough for all of the engine case halves and the clutch cover including the drain bolt and oil level bolts.