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■For vehicles equipped with SP Takegawa Stage Big Bore Kit 181cc [Components] Big throttle
*The 181cc SP Takegawa S-stage Big Bore Kit is applicable to bikes equipped with the 181cc kit. *This kit does not fit the e stage big bore kit 143cc. *Cylinders used for SP Takegawa S-stage are reused, but do not use them if they are worn beyond the limit of use. *If you are using SP Takegawa's FI CON2 for S-stage, you need to rewrite the program for Superhead 4V+R and replace with high capacity injectors by SP Takegawa.Paid FI CON2 upgrade work (high-capacity injectors included) *Since clutch slippage occurs with higher output, we recommend installing SP Takegawa's reinforced clutch spring (30%UP) 02-01-0144 at the same time.
FI CON2 for GROM (JC61-1000001-1299999) and MSX125 cannot be upgraded to FI CON2 for GROM (JC61-1300001-) and MSX125SF. Also, the installation harness COMP. for GROM (JC61-1000001-12999999) and MSX125 is different from that for GROM (JC61-1300001-) and MSX125SF, and cannot be installed. *The big throttle body version requires modification to enlarge the inner diameter of the mounting section of the air cleaner case when installing. *Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change.
You can step up from SP Takegawa's S-stage Big Bore Kit 181cc to Superhead 4V+R Big Bore Kit 181cc. Superhead 4V+R is available at a lower price than the usual full kit.
■Superhead 4V+R (1cam 4valve) details Two intake / exhaust valves are used each to increase the valve curtain area and achieve high intake / exhaust efficiency. The original head shape was designed to balance the center plug, valve pinching angle, combustion chamber shape, and port shape to achieve a higher output than the stock head. The combustion chamber is finished with high accuracy by NC machining.
■The highest class of SOHC intake and exhaust efficiency Valve diameter IN: 25mm x 2 / EX: 21.5mm x 2 Valve Stem Shaft Diameter: 4. 5mm for both IN and EX The use of unequal pitch valve springs suppresses surging at high rpm. The cylinder head surface is painted black. Since the inspection breather cover is included, you can release the internal pressure of the engine by purchasing the oil catch tank kit separately.Inspection Breather Cover and Inspection Cover are machined from aluminum and plated with beautiful chrome. L. Cylinder head side cover is made of die-cast aluminum with barrel polished finish.
■Superhead 4V+R Adopted Parts ・Forged aluminum roller locker arms The frictional resistance with the camshaft is reduced, and smooth operation is realized. ・Auto decompression camshaft It is possible to start the engine smoothly without putting a burden on the starter.
■Superhead 4V+R Big Bore Kit Adopted Parts ・Aluminum casting piston Compression ratio 12.5: High comp specification with 1 Pistons designed for high performance and durability.The piston top is NC machined for high precision.
■Big throttle body specification The Big Throttle Body specification maximizes the performance of the Superhead 4V+R head and delivers higher power output. The engine turns without stress up to the high rpm range. Big throttle body dia: Φ34 Connecting tube included for connection to stock air cleaner box When installing the air cleaner case, it is necessary to enlarge the inside diameter of the mounting area of the air cleaner case.
■FI CON2 version upgrade work is required. If you are using SP Takegawa's FI CON2 (Injection Controller) for S-stage, you need to rewrite the program for Superhead 4V+R at SP Takegawa. SP Takegawa offers FI CON2 Version Upgrade Work for a fee to rewrite the program to be compatible with FI CON2.For the service, please send the FI CON2 to SP Takegawa, and our technical staff will rewrite the program and return the FI CON2 with high capacity injectors. ・FI Controller 2 upgrade work (high-capacity injector included) There are three types of FI CON2 upgrade work for GROM (JC61-1000001-12999999), GROM (JC61-1300001-) /MSX125SF, and MSX125.
[Notes] *FI control 2 for S-stage made by SP Takegawa is applicable. *Shipping and handling fees will be charged separately. *The Controller must be in good working order for the rewriting work to be performed. *We reserve the right to refuse work in the case of malfunction or significant damage to the equipment.
Paid FI CON2 upgrade work (high-capacity injectors included) Since clutch slippage occurs with higher output, we recommend installing SP Takegawa's reinforced clutch spring (30%UP) 02-01-0144 at the same time.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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