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Another custom nice engine
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<blockquote data-quote="fatcaaat" data-source="post: 202131" data-attributes="member: 1656"><p>Ok...here's a good update, finally! After all that work, getting the tensioner stuff sorted, I'm pleased to report that the motor ran flawlessly over the course of a 15 miles shake down ride. No cam chain slapping, no funny noises. It runs very smoothly at speed, and while I didn't go past 7500 on the rpms, it seems it will be fine at that engine speed. It has significantly more power than a stock honda nice engine. </p><p></p><p>With the super light and balanced rotating assembly, it is extremely smooth...nearly vibration free above 5krpm. However, the tradeoff to that light assembly is that you cannot lug the motor. If you get it under 4-4500 you have to downshift. You can get away with it in 1st and second gear, but not really in third or forth. It does power wheelie in first which is fun. </p><p></p><p>Im not impressed with the idle. you do need to set the idle to about 2000 rpm to keep that lightened setup going. and you most certainly are clutching it more on takeoff. Thats the tradeoff I suppose for really quick acceleration, much less engine braking, and improved throttle response all around. It can make things a little jerky until you are used to it. </p><p></p><p>I'm going to change the gearing by dropping the rear 1 tooth...it won't make a lot of difference but since I have a 32t sprocket and need to look into why the rear brakes are not donig their job, figured I'd swap it while i'm back there. </p><p></p><p>I'm VERY surprised it is not leaking anywhere at the head or at the base gasket. The nice does not use the o rings between the head/cylinder/cases but I did smear yamabond on the oil routes so very pleased with this outcome. </p><p></p><p>Right now there is only one issue, but I'm not sure if it's a real issue or not. But according to the thermometer dip stick, the engine is running quite a bit hotter than my other motors. The temp reached a steady state of 120c or 248f which is on the cusp of overheating. However, when I came back from the ride and hit it with the infrared gun, the engine was below 220f everywhere I shot it except right near the sparkplug which was 260. That doesn't seem too hot now does it? </p><p></p><p>It was a long road to get this motor built and dialed in but generally I'm pretty pleased with it. I will say that it runs very differently than the tractor style motor's i generally build and run and I'm still adjusting to it. However, it's nice to have something a little different to run. It won't be a bike of choice to run where I'd get into some traffic, but it would be pretty nice to get out on some back roads and twisties and rev this thing out. Looks like it will be a good engine to put through the paces.</p></blockquote><p></p>
[QUOTE="fatcaaat, post: 202131, member: 1656"] Ok...here's a good update, finally! After all that work, getting the tensioner stuff sorted, I'm pleased to report that the motor ran flawlessly over the course of a 15 miles shake down ride. No cam chain slapping, no funny noises. It runs very smoothly at speed, and while I didn't go past 7500 on the rpms, it seems it will be fine at that engine speed. It has significantly more power than a stock honda nice engine. With the super light and balanced rotating assembly, it is extremely smooth...nearly vibration free above 5krpm. However, the tradeoff to that light assembly is that you cannot lug the motor. If you get it under 4-4500 you have to downshift. You can get away with it in 1st and second gear, but not really in third or forth. It does power wheelie in first which is fun. Im not impressed with the idle. you do need to set the idle to about 2000 rpm to keep that lightened setup going. and you most certainly are clutching it more on takeoff. Thats the tradeoff I suppose for really quick acceleration, much less engine braking, and improved throttle response all around. It can make things a little jerky until you are used to it. I'm going to change the gearing by dropping the rear 1 tooth...it won't make a lot of difference but since I have a 32t sprocket and need to look into why the rear brakes are not donig their job, figured I'd swap it while i'm back there. I'm VERY surprised it is not leaking anywhere at the head or at the base gasket. The nice does not use the o rings between the head/cylinder/cases but I did smear yamabond on the oil routes so very pleased with this outcome. Right now there is only one issue, but I'm not sure if it's a real issue or not. But according to the thermometer dip stick, the engine is running quite a bit hotter than my other motors. The temp reached a steady state of 120c or 248f which is on the cusp of overheating. However, when I came back from the ride and hit it with the infrared gun, the engine was below 220f everywhere I shot it except right near the sparkplug which was 260. That doesn't seem too hot now does it? It was a long road to get this motor built and dialed in but generally I'm pretty pleased with it. I will say that it runs very differently than the tractor style motor's i generally build and run and I'm still adjusting to it. However, it's nice to have something a little different to run. It won't be a bike of choice to run where I'd get into some traffic, but it would be pretty nice to get out on some back roads and twisties and rev this thing out. Looks like it will be a good engine to put through the paces. [/QUOTE]
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