New Hawk, new adventures.

[Megadan]

So I may as well let the cat out of the bag now. I was finally able to contact somebody in Brazil that can sell me one of the WGK camshafts. Cost shipped is $95, so it is not the cheapest mod ever, but I think it makes more sense to try this to try and achieve my goals and get that last little bit of power out of my CG before dropping hundreds on a different engine, even if said engine has that extra gear I so crave. I am going for the WGK 1010851 which is designed to be installed without any other modifications to the engine, but increases total duration and overlap to shift the power curve up the RPM range a bit.

[OneLeggedRider]

Sweet Dan, and I'm sure that involves splitting the cases.

In reference to the inline twin, if Honda couldn't get it right, what makes you think anyone else could? The exception to the rule is Yamaha's Banshee 350, but that was 2-stroke and needed re-ringed every 16 hours.

[Wild Dog]

Originally Posted by Megadan

So I may as well let the cat out of the bag now. I was finally able to contact somebody in Brazil that can sell me one of the WGK camshafts. Cost shipped is $95, so it is not the cheapest mod ever, but I think it makes more sense to try this to try and achieve my goals and get that last little bit of power out of my CG before dropping hundreds on a different engine, even if said engine has that extra gear I so crave. I am going for the WGK 1010851 which is designed to be installed without any other modifications to the engine, but increases total duration and overlap to shift the power curve up the RPM range a bit.

Nice and the price is more than OK for the price. Since you found someone that ships you from Brazil, try to source from them, some of this


Plus some better valves and springs.

[Megadan]

Originally Posted by Wild Dog

Nice and the price is more than OK for the price. Since you found someone that ships you from Brazil, try to source from them, some of this
Attachment 18957

Plus some better valves and springs.

I am actually not a fan of roller lifters/followers. Flat tappets are much simpler and more reliable. Valve springs shouldn't be necessary with the cam I am getting, but if they are I already know a source in the U.S. for Honda springs. As far as the valves, I would like better ones for sure.

I have possible plans involving my original head and some more serious engine work. For now I just want to push the envelope with what I have.

[Megadan]

Originally Posted by OneLeggedRider

Sweet Dan, and I'm sure that involves splitting the cases.

Nope! It does require removing the jug and pulling the flywheel, but the cases can remain intact.

[Megadan]

Camshaft is on order. I await tracking information which should come sometime this morning. Then it is just the long wait for it to show up, likely at least 3 or 4 weeks. Been a while since I was excited about something with my Hawk. I hope that it pushes me into that extra bit of power I crave and opens up the rest of the RPM range. It's frustrating knowing that the engine could easily rev another 1500rpm safely, but just doesn't have the guts to get there.

[franque]

Do you care sharing with the class from whom you're ordering?

[Megadan]

Originally Posted by franque

Do you care sharing with the class from whom you're ordering?

Once I have the part in hand I will for sure. I want to make sure all goes well before I go sending others off with their hard earned money.

[JerryHawk250]

I hope this turns out to be a winner. I've ran out of mods to do on my Hawk.

[OneLeggedRider]

Originally Posted by JerryHawk250

I hope this turns out to be a winner. I've ran out of mods to do on my Hawk.

520 chain and Honda sprocket studs? 🤔

[Megadan]

Originally Posted by JerryHawk250

I hope this turns out to be a winner. I've ran out of mods to do on my Hawk.

I am sorta out of mods after the camshaft, at least short of going all out with the engine build, which isn't the point of what I am trying to do. I want to see how far I can take it without custom parts and expensive machine work.

I don't doubt that this cam will help me get where I want to be. I will gladly sacrifice a little mid range grunt if it means I can utilize the full rpm range of the motor. Especially after the head porting and PE30 carb. I have midrange to spare.

I am considering finding some upgraded pushrods to go along with the cam. 152mm length (1mm shorter) to compensate for the decked head and restore the geometry a little bit. I just dont remember the thickness off the top of my head.

[JerryHawk250]

That's my goal with my Hawk. Get the best performance out of the CG engine with just ad-ons and without getting into any major machine work. Just like the head work. I could of paid someone to do the work and machine down the head but showed that it can be done with minimal tools and skills. Is it perfect, Probably not but definite improvement. The cam will be the final mod that will more than likely get these engines running at there peak performance and not sacrifice reliability.

[Megadan]

Originally Posted by JerryHawk250

That's my goal with my Hawk. Get the best performance out of the CG engine with just ad-ons and without getting into any major machine work. Just like the head work. I could of paid someone to do the work and machine down the head but showed that it can be done with minimal tools and skills. Is it perfect, Probably not but definite improvement. The cam will be the final mod that will more than likely get these engines running at there peak performance and not sacrifice reliability.

To be honest, I would love to build a high spec, blueprinted, properly balanced CG clone. Just not with the motor I have now. If I were to go all out on a CG engine I would want to buy a new one and strip it down, then build it back up with high quality bearings, the transmission, crank, rod, pin, etc all sent in for cryo treating. Crank alignment checked and corrected, then the crank and rod balanced. Followed by whatever piston was used and the cylinder decked to set the quench gap at .030 followed by a professionally ported head with recessed valve pockets, stainless steel valves, and a more aggressive cam with added lift.

Then I could have a 24whp 229cc engine that revs out to almost 10,000rpm for all of my effort and a lot of invested time and money.

Would it be cool? sure would. Would it be reliable? maybe. It sure as heck wouldn't be cheaper than buying a bike with a more powerful engine as standard though lol.

Alternatively, our home brew DIY machines could reach close to that. If I even put down 20-21whp doing it the way we have done it, I call it a success.

They way I see it. We started with, at most 15hp at the crank - rated at 14.2 if I remember correctly, but with terrible jetting, so 15 with proper jetting

With an intake and exhaust and a properly tuned carb, that figure bumped up to maybe 17-18hp. With the basic head porting and a bump in compression combined with the 30mm carbs, we are likely sitting right around 20hp ( about 18 at the wheel) when considering our jetting, with a lot more power under the curve in the lower RPM ranges, especially between 3000-6000rpm.

Now we are mainly limited by the cam profile. It just doesn't allow these motors to breathe well enough at the top end of the RPM range. With the 30mm carbs and a better cam to extend the power curve out past 7000-7500m it should be good for about another 2hp, give or take a tenth or two. That would ball park us right around at least 20 wheel hp.

If the pickup in power felt anything like the ported head and PE30 combo, which was a dramatic difference, I know I would be happy.

Funny related side story. A guy commented on one of my videos about porting his head and putting the Nibbi carb on his bike after watching one of my other videos, said it was the greatest mod he has ever done to his Hawk lol.
"BEST MOD EVER!"

[JerryHawk250]

If I were to do a build I think I would start with a true 249cc CB engine just because of the cam options.

Oh I agree with the head work. Best Mod Ever.

[Megadan]

Originally Posted by JerryHawk250

If I were to do a build I think I would start with a true 249cc CB engine just because of the cam options.

Oh I agree with the head work. Best Mod Ever.

Same with me, but you get the point I was trying to make about what I am doing vs. The ultimate approach for power. People always add in "you should do x, y, z." suggestions, which I appreciate, but it goes against the semi budget approach. I may still be spending a decent amount of money, but compared to what I could spend it is still cheap lol.

The head work on its own, while it made a difference, was underwhelming on its own. A couple of guys I talked to that have fitted a 30mm carb to an unported bike said that, it did something, but was a little underwhelming. The two combined compliment each other extremely well, as you know. The stock head and pz30/vm26 are a perfect match. Change either one and you are partially held back by the other.

If you had to buy a Wen tool, bits, and say a more budget carb like yours or the not 100 buck clone of a PE30, you would be all in for about maybe 100 bucks, 200 with the exhaust included, for a pretty substantial increase in power over stock. Basically for another 100 the cam is the cherry on top. 300 bucks for what is essentially a 7 to 8 hp increase from stock, which is a 50% increase in power, is the bargain of the century. You just have to be willing to get your hands a bit dirty lol.

Edit. Keep in mind my hp figures are educated estimates based on data from various sources, so some grains of salt are needed. They arent too far off base though.