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I was going through possibility of making the 313 cc cylinder to bigger one and BMW's 350 cc scooter the C400X felt like direct fit but I am not sure on it's construction to accommodate the water jacket, plumbing, crank rod length etc.
The bore is same in both engines at 80 mm only stroke is longer on 350 cc engine at 69.6 mm against 313 cc engines 62.1 mm, so this 7.5 mm adds extra 37 cc, the power figure is same but it comes as early as 7500 RPM against g310's 9500 rpm.
Worth considering if it needs only the cylinder kit replacement with timing chain, longer crank and few small bits here n there.
Members having access to c400x engine physically or over the net do share more info on the same. I am sure this mod is going to sort out those issues of bike lagging the power and shutting down at low speeds.
 

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nope, don't think it will fit. Also, bear in mind that the engine in the G310 is turned 180 degrees compared to the scooter and the C400X.

What are these 'issues' of the bike lagging the power and shutting down at low speeds? I haven't heard of these.

P.S. it would be nice to get a bit more power out of the bike, but where do you stop? Any more power and the bike would no longer be suitable for beginners.
 

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I agree with oldtimer - it really isn't worth it for 37cc. I'd be surprised if you got much more than 1 or 2 hp at best out of that...

More to the point, even if the crank rod and piston would physically fit in the 310 engine, you can bet the profile of the piston and cylinder head would be different so you'd not get the correct combustion chamber profile without further machining - it would be a complete waste of time.

Ride the 310 for what it is, and if you genuinely need more 'performance' get a different bike...

... or go mental and try swapping another engine into the frame perhaps ;o)

Jenny x
 

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I plan to put the REMUS exhaust onto my 310 GS. This is mainly for the better routing of the exhaust for off-roading, but it's specs say it will increase torque & HP. That is about the best increase for the lil' GS you'll find currently. I'll let you know if I can feel the difference once I get it & have some miles on it to know for sure.
 

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WOW! Put the Remus exhaust on last weekend, and UNHOLY **** IS IT LOUD!!! Had to put the silencer back in as that was too **** much for going down the highway! HaHaHa! I have to say the +HP was noticeable, and the wheelies popped up a bit in 2nd gear too! That never happened before! Not much, but a little lift after the shift coming down from the wheelie in 1st. Lots of fun! Sounds like a drag bike compared to stock. Didn't sound like a 310cc at all!
 

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This is quite stale. Suspect folks realized that this motor is super as is. If you are not happy then fetch up a different unit. However if one had money and time to spare, I would suggest adding nitrous oxide.
 

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I was going through possibility of making the 313 cc cylinder to bigger one and BMW's 350 cc scooter the C400X felt like direct fit but I am not sure on it's construction to accommodate the water jacket, plumbing, crank rod length etc.
The bore is same in both engines at 80 mm only stroke is longer on 350 cc engine at 69.6 mm against 313 cc engines 62.1 mm, so this 7.5 mm adds extra 37 cc, the power figure is same but it comes as early as 7500 RPM against g310's 9500 rpm.
Worth considering if it needs only the cylinder kit replacement with timing chain, longer crank and few small bits here n there.
Members having access to c400x engine physically or over the net do share more info on the same. I am sure this mod is going to sort out those issues of bike lagging the power and shutting down at low speeds.
There is no direct fitting for cylinders with BMW. NativeRacing developed a G310R engine that makes 41hp at the wheel, 325 cc , forged piston, HMU if your interested or contact us at www.RaceNative.com
 

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Kudos to NER for accomplishing this....and I'm sure your RR is a world of fun (on the track) but it is still being overtaken by the Kawa's.

So as much as I respect the engineering, I still fail to see the point to trying to extract more power from a 313 cc motor.
But hey, that's only me, please don't let that stop what you're doing !
 

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Indeed it is true, the Ninja400 is a mean machine. The program was about opening another option for riders that would like one. I think we can all agree, if raw power is what your after, sub 500cc bikes are really the wrong place to be, lol!
 

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There’s more than crazy power at NER. I think there are a few members who really feel the need to have a tuner, which these folks offer. I was impressed with the Andreni cartridges. The first for to see offered by resale rather than just buying from eBay. Perhaps a better option there for front suspension than adding a spring and dampener ala RR. Easy adjusting preload.
There’s always a segment that has the urge to modify their ride, wether or not it makes sense. Not my thing but its great for the Industry in general.
 
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