Hawk locking up

[JerryHawk250]

APSCUSA has the complete engine for $499 with free shipping http://www.apscusa.com/Hawk-250-engine_p_660.html but notice it is on back order. Check with TXPowersports and see if they can get it. That way you will have spare parts from the old engine and a head you can practice porting on. This may be the less expensive way to go and will be plug and play.

[Sullybiker]

Regarding chain tension, I was of the opinion that CSC's 15mm spec was on the tight side, but I consider the manufacturer's manual as authoritative; they obviously know what they're talking about.

The difficult part is it's way too easy to over-tighten it if chasing that spec, especially given how much the swingarm moves. So, like all my bikes, I run it a little at the loose end.

I can tell when it gets too slack as the chain lash can pop the bike into neutral at low speeds.

I have actually let it get sufficiently slack to jump the rear sprocket going over a bump. How loose? Well not as much as you'd think, probably just a little over 2x the spec.

So it's difficult. At least for me.

[franque]

You actually have to adjust the chain to the listed spec when the bike is laden, like you need to be sitting on the bike when you adjust to spec. That's a big part (I assume) of why it was too tight.

[silva]

Or maybe this 6 speed

https://www.yoycart.com/Product/40634641602/

[JerryHawk250]

Originally Posted by silva

Or maybe this 6 speed

https://www.yoycart.com/Product/40634641602/

That would be my choice of engine if I ever had to replace it.


Original Post on the engine http://chinariders.net/showthread.php?t=18754&page=3

[Merlin]

Originally Posted by silva

Or maybe this 6 speed

https://www.yoycart.com/Product/40634641602/

This is what I would love in one of these bikes.

[Sullybiker]

Originally Posted by franque

You actually have to adjust the chain to the listed spec when the bike is laden, like you need to be sitting on the bike when you adjust to spec. That's a big part (I assume) of why it was too tight.

yes, on my Kawi there's not much difference between loaded and unloaded, on the 'Zong it's significant.

[Megadan]

Originally Posted by Sullybiker

Regarding chain tension, I was of the opinion that CSC's 15mm spec was on the tight side, but I consider the manufacturer's manual as authoritative; they obviously know what they're talking about.

The difficult part is it's way too easy to over-tighten it if chasing that spec, especially given how much the swingarm moves. So, like all my bikes, I run it a little at the loose end.

I can tell when it gets too slack as the chain lash can pop the bike into neutral at low speeds.

I have actually let it get sufficiently slack to jump the rear sprocket going over a bump. How loose? Well not as much as you'd think, probably just a little over 2x the spec.

So it's difficult. At least for me.

Originally Posted by franque

You actually have to adjust the chain to the listed spec when the bike is laden, like you need to be sitting on the bike when you adjust to spec. That's a big part (I assume) of why it was too tight.

This this this this this this ^

I have found that with the bike unladen, on a stand - rear tire with no weight on it, the chain slack is actually around or a tiny bit more than 1 inch/25mm.

I will set my chain to that figure, then put the bike on the ground, lay over the seat with my head on the chain side, and while hanging upside down check the slack. This method is a pain in the ass acrobatics act, but it has worked well for me. If you can get somebody of similar size to sit on the bike it will make life a million times easier. Then, once you get it set, put the bike back up on a stand and unload that rear wheel and measure that slack figure and write it down somewhere. Now you can set the chain tension without having to do the "Inverted Mechanic" yoga pose.

[letsride]

Originally Posted by silva

Or maybe this 6 speed

https://www.yoycart.com/Product/40634641602/

X3! a six speed, counter balanced motor? YES PLEASE!

[Lit Hawk]

Great info guys, hopefully help future hawk owner. I’m not ready to give this engine up yet, I think I can still get more mileage out of her yet. RPS sent me a viper cover instead of hawk so they’re mailing me there last engine cover they have in stock. I bookmarked the 6 speed engine which looks awesome just don’t really have the funds right now. Unless I absolutely have to, wife’s ready to kill me she don’t get it Idle hands are the devils workshop!

[timcosby]

yea you could be at the bar chasing rabbits

[Megadan]

That counterbalancer one the 6spd may prove problematic for a Hawk. The TT250 frame is kicked out where the downtube splits to accomodate for a counter balancer, but the Hawk does not. You may be able to make it fit a Hawk, but that is a big unknown. If not, order up a tt250 frame to go with said motor and swap the hawk stuff over.

[JerryHawk250]

Originally Posted by Megadan

That counterbalancer one the 6spd may prove problematic for a Hawk. The TT250 frame is kicked out where the downtube splits to accomodate for a counter balancer, but the Hawk does not. You may be able to make it fit a Hawk, but that is a big unknown. If not, order up a tt250 frame to go with said motor and swap the hawk stuff over.

I had looked into that before. The counter balance doesn't stick out as far as the TT250 engine does. I had found a drawing with all the dimensions for the mounting points. It would of cleared the frame. Just would had to make new motor mount plates at the front.

[Megadan]

Originally Posted by JerryHawk250

I had looked into that before. The counter balance doesn't stick out as far as the TT250 engine does. I had found a drawing with all the dimensions for the mounting points. It would of cleared the frame. Just would had to make new motor mount plates at the front.

That is a good point. The balancer is definitely more tucked in. It wouldn't be much of a power increase stock for stock, but having an extra gear would make running shorter gearing for off-road possible while still retaining some on-road lower-rev highway capability.

If I blew up my Hawk engine I would probably try and make one of these work.

[ben2go]

Originally Posted by Megadan

This this this this this this ^

I have found that with the bike unladen, on a stand - rear tire with no weight on it, the chain slack is actually around or a tiny bit more than 1 inch/25mm.

I will set my chain to that figure, then put the bike on the ground, lay over the seat with my head on the chain side, and while hanging upside down check the slack. This method is a pain in the ass acrobatics act, but it has worked well for me. If you can get somebody of similar size to sit on the bike it will make life a million times easier. Then, once you get it set, put the bike back up on a stand and unload that rear wheel and measure that slack figure and write it down somewhere. Now you can set the chain tension without having to do the "Inverted Mechanic" yoga pose.

Ratchet strap Dan, ratchet strap.