Follow along for custom 150cc honda nice.

I usually buy duplicolor or rustoleum engine paint with ceramic. Whatever is on sale. If you cure them they are really tough. I cannot make a mark with my nail no matter how hard i try. And they have to be cured or carb cleaner and gas eats paint. I short cutted the covers on the forst 150 and they need to be redone as gas messed up the stator side and the clutch side got nicked up having to take it on and off a bunch of times
 
Most people don't realize that when they paint engines with engine enamel it is the heat of the engine that cures it after a few heat cycles. Unfortunately, many people are playing around with carbs and jets before the paint is cured and gets damaged. The only way to make sure is to approach it this way. I looked at the can and this is Rustoleum Engine with Ceramic for 600 degrees. Once you cure this stuff it is hard as nails. That's the trick. you can cure it a few ways...on top of the stove actually works the best for me, but you can run a heat gun on it for a few hours from the unpainted side, you can put it in your oven at about 275 for a few hours, you can put it on a clean gas grill ( i used to do it this way until i put my gas grill out at my cabin). You have to get it up to about 275 for at least two hours IMO.
 
def make sure you do it on the outside. I once put a case half inside my gas grill to heat up so I could drop a bearing in it...it was a norton commando case. it came out a little yellow from the smoke.
 
Mostly finished up the other 151 today. Just missing some seals and some nicer plastic covers. It will be interesting to see how this motor compares to the first one as the only difference is the head and piston and carb.
 

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The second 151 was run today. As a reminder, this is a twin to the first one this thread is created from, but it is running a stock head with a cam and was running a VM20 carb. This one runs the Trailbikes V2 roller rocker head with the big 27/23 valves, a VM26 carb and an aluminum oil sling to take the weight off the rotating assembly and a lightened flywheel. Running the same exhaust and same gearing.

Well, as our friend Racerx would say...you can feel it by the "seat of the pants dyno" and it is a little more than that. You feel it by the throwing you backward as you accelerate. It started on the second kick and idled pretty nicely. The VM26 is jetted 22.5/190 from factory and I'll be within 1 main and two pilots till we are done, so it was a good starting point to let it be.

The engine is crisp on the kickstand, but it has a dead spot in the midrange under load. I have not really ridden it yet as I just ran it through the neighborhood as a first heat cycle. Pleased to see there are no leaks.

A twist of the throttle and you can tell immediately that this is a different animal. It is louder, revs up faster, and clearly accelerates faster. I wouldn't be surprised if this has at least 4 HP more than the other setup. I'm predicting that this will have 17 RWHP when its all done which will be good for just shy of 80mph on this particular bike. You cannot lug it like the other one...that probably has a lot to do with the lightened rotating assembly and also the cam on the roller rocker is more of a mid-upper range cam, whereas the cam I put in the stock head has big lift but mild rotation giving great off throttle torque.

I'll be heat cycling it over the next few days and hopefully we will have decent weather for me to take it out for a pass on the test route.

More than likely, this is the same head combination I am going to put on top of the Dry Clutch build too. Takegawa has discontinued the 2V Superhead +R and only has the 4 valve. I Don't see any advantage of the 4 valve setup after having having a Takegawa 2v+4, Takegawa 4v+r, Trailebikes 2v Roller and the Kitaco 4v DOHC setups. The only exception is the Takegawa 2V+r I have that is reworked to a 30/25 valves on the 176.
 
I was out with the v2 head version today for a 20 mile test run. Jetting is close but main is too rich. Powerwise i had no trouble keeping up with traffic on a 4 lane posted 55. Speedo isn’t accurate as it was pegged beyond the 50 max much earlier than realistic. Id say my gearing is probably a tad too tall and ill consider dropping the front one tooth.

Id bet it maxes low 70’s which is what I expected.

The head and carb combo probably adds 10mph on the same gearing. It is also clear the pipe is restricting this setup but likely optimized for stock head.
 
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