Where did everyone order their engines from? I see plenty of Cg250's on ebay and Amazon and Xpro Amazon sells a CR250. The only place I see alot of other options are the A1j website.
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Can you post a few close up photos of the mounting of this 4 valve 250 in the Grom clone? I still can't believe it. I mean photos showing the head in that frame! Thanks! |
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its only a tight fit for the throttle cable on the pwk32 carb. only about 1/2 inch space between the throttle cable and the tank.
you see that blue hose connecting the carb to the manifold? im going to try a piece of 1.5 inch diameter pipe instead of this silicone blue hose to connect it to the manifold i think because i can feel that hose slightly collapsing and expanding when the engine is running. the frame is in the way so that 3 inch section of hose is needed to move the carb back close to the rear tire to clear the frame . im talking about the side setion if the frame being in the way because that manifold angles to the right and i cant find a better manifold one because it needs to be oval not circle to match intake port on the motor. |
That is one seriously musclebound Grom clone.
It looks gnarly, probably rides that way too :) Nice |
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How the progress?
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I'm going to do this to my RPS Condor, but I think I'm going to use a 2 valve engine for 19HP. Updates?
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And you managed to get oil cooler/lines in there too. Wow. |
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OK, I just pulled the trigger on the 4-valve 250. There is also a 4 valve 300, but it appears to have a funny exhaust angle, so I thought 23hp would be enough. The 300 is the Zongshen NB300-F Someone should try this out. |
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I think when you go down on carb size, you also have to go down on jet size because the smaller throat and higher flow results in a much more powerful venturi. I'm planning on using my pz27 on it. I would love the wide band. It is telling you you're rich when it said to bring the jet size smaller. This makes sense when you think about it because the airflow is increasing while the throat isn't so you get a bigger change in pressure. Now I need an oil cooler. I ordered a 30 tooth 520 JT rear sprocket for a grom that I hope will work. I don't think there is room for a 16 or 17 up front. I'm also going to get creative to get that intake right. |
I doubt a 300 will fit, but it might. Some YouTuber put a CBR300R engine on a Grom. So you never know.
Personally, I think the Sweet spot is between 175cc and 200cc. You still get good fuel economy, especially if it's a higher compression engine, tuned well, but also a lot more torque and top speed than the 150. I'm wondering if it was a plug and play, or did you need to weld any mounts? From the space I see inside that bike, I probably would want a size smaller engine. Quote:
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