We will reveal a friend's project, our neighbour Hugo, who has plenty of bikes, but this one, was RacingSM who made the project, we're talking about an Honda CRM 50.
Now, the CRM evolution, with pictures and the respective description:
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Initial phase, the naked frame in our workshop, already painted in blue. |
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Some photos of the assembly process, the CRM was gaining form, initially with the blue 18' Excel rims, that would be replaced with two San Remo blue rims.. |
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In the left photo, the naked frame as well as the stock chrome swingarm, just to check out how would be the final product..
Right photo, a front preview of the engine, already assembled and tuned. |
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The Honda CRM 50 tuned engine already fitted on the frame in the left photo, on the right photo with the exhaust system already fitted. |
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Another preview of the engine, in two different prespectives, using the stock flywheel slightly roughed-hew. |
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Two photos revealing the detail of the exhaust system, as well as the Honda CRM 50 tuned engine |
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Again, more photos of the Honda CRM 50 tuned engine. |
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Finally the Honda CRM 50 is ready for rolling! |
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Left photo, a perspective of the cylinder admission with the piston on the top. |
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Two other perspectives.. |
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It's done! |
The engine tuning specifications (by LuFo): (The power output predicted for this engine preparation is about near 30 engine hp in a reliable Dyno.)
 Big bore kit 99.34 cc, using stroke 43.4mm and WISECO Suzuki RM 125 1987' piston 54mm. |
New cylinder diagram, reshaped ports and transfers.
Modified cylinder head for new compression ratio of 13.8:1, using unleaded 98 RON gas.
True crankshaft, added weight with lead for maximum precision and balanced with a new tendency to the TDC.
Honda NS1 connecting-rod genuine part.
Dellorto VHSB 34mm polished carburetor, without using any kind of air filter. |
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VFORCE CR 80 carbon reed pack.
Yamaha DT 125R modified inlet manifold for new 34mm carburetor.
Hand-made exhaust system, for ~ 13 000 in charge.
Carbon DLR silencer, used in a Honda RS 125 of the Italian GP ( thanks Orelhas!)
64.8% of engine square index.
Brown Honda NSR 50 CDI with new ignition diagram map by LuFo.
Stock flywheel slightly roughed-hew.
Stock gearbox. |
Front stock Honda CRM 50 conventional suspension with it's height reduced. |
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Stock SHOWA rear suspension, but with new suspension stroke and more rigidity.
Stock hubs, painted in gold racing.
Stock frame, painted in blue.
Stock swingarm chromed.
San Remo blue rims with polished borders, front and rear with 2.5' width both.
Dunlop 95/60x17' slick tyres both front and rear. |
Transmission with front 17 sprocket and rear sprocket with 38 tooth making real 157 km/h @ GPS in 6th gear proved above. |
Real 157 km/h in 6th gear with 17 - 38 secondary transmission, filmed and comproved with GPS/Global Positioning System (GPS on CRM at the velocity test)
Some people will ask: "Aren't you forgetting some variables on the program? Like the attrition coefficient!"
That's exactly why we used the Global Positioning System, cause it gives us the real velocity of an vehicle, independently the attrition coefficient, so, with the value of the real velocity, we can achieve the rotation in charge that the engine was making at that moment (12 400 rpm in this case) , so no imperfections! |
Theorical evidence with RacingSM Software:
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