Hawk tune up, top speed, and general musings.

[o2jmpr]

Originally Posted by OneLeggedRider

My my..

Wow, I thought we were better than this on this forum. Thanks OneLeggedRider for bringing this to light.

[JerryHawk250]

Originally Posted by OneLeggedRider

I've already got the dremel and all the necessary goodies, and just this morning I priced a TT250 head at $85 plus shipping. I'd have to order some measurement tools but I should have them anyway.

If you add a few more items like head gasket, brake pads and so on to get it over $100 you will get free shipping. You might as well get the few extra part for the cost of what the shipping will cost.

[OneLeggedRider]

Good thinking Jerry. I wonder if the TT250 head gasket is any thicker or thinner. And is there enough clearance in the frame to pull the head without pulling the motor?

[JerryHawk250]

Originally Posted by OneLeggedRider

Good thinking Jerry. I wonder if the TT250 head gasket is any thicker or thinner. And is there enough clearance in the frame to pull the head without pulling the motor?

From what one of the other members stated in his thread it was a thinner gasket. There is plenty enough room the remove the head without pulling the engine.

[Megadan]

Originally Posted by OneLeggedRider

Perhaps I was a little rude with him when I commented on doing something useful, but I just get tired of him plugging his wares on posts that aren't relevant. I definitely don't need a first tune kit and I was joking about starting over with the Mikuni clone. And I think some of his kits are a definite value, but just ease up on spamming every post.

You weren't rude, at least not by my standard, and I agree with you 100%. Anytime somebody mentions the mikuni, *poof*

Originally Posted by o2jmpr

Wow, I thought we were better than this on this forum. Thanks OneLeggedRider for bringing this to light.

I guess it wasn't obvious before with my many interactions.

Originally Posted by OneLeggedRider

Good thinking Jerry. I wonder if the TT250 head gasket is any thicker or thinner. And is there enough clearance in the frame to pull the head without pulling the motor?

Yep, plenty of room to pull the head. I actually did a video on it, though it isn't the greatest.

To touch on a different point. The pumper carb would be advantageous on a stock engine as well, especially one with an exhaust and intake. No need for head porting to take advantage of it.

[dpl096]

Damn it Dan.... That stuff is disgusting..,. Puke

[Merlin]

Perhaps this is more to your liking:
https://www.dailymotion.com/video/x2hwqlw

[OneLeggedRider]

Took the bike out for 3 hours tonight, and I have definitely got the carb right. This thing is pulling so hard, idling so well, starting so good, etc.. It did stall on me one time in town because of clutch fade, but I know an oil cooler will fix that. And I'm gonna order a 13 tooth front sprocket for more speed, I can always switch sprockets if I'm going riding at the Reclaim. Also figured out 5 washers on the muffler wasn't quite enough, but I can live with it barely touching at full suspension compression. Loving this bike!

[OneLeggedRider]

I forgot to include this about cold starting. With a. 45mm pilot and 3.5 washers on the needle it's getting plenty of fuel. At 75° I don't need the choke at all, and if I do put it on half choke I have to take the choke off immediately, and if I try full choke it will start but acts like it's drowning, I think I almost fouled the plug lol. And I really paid attention to the deceleration yesterday, I kinda miss the snap crackle pop.

[o2jmpr]

My Hawk behaves the same way. I have two .032 washers on the stock carb needle. No choke is needed unless it's quite cold and then half choke for only ~10.15 seconds. Full choke will always kill it. I'm running stock pilot though so I always turn my idle set up 1/4 turn to start and warm for a minute then turn it back down to where it sounds right. I do still get some light popping when decelerating but I just quit worrying about it. Glad to hear your'e stoked!

IIRC, Megadan once posted that above 80, choke ususally wasn't necessary but probably still recommended. 60-80 was half choke range and below 60 full choke. Of course, he has his tuned to perfection I'm sure and you both definitely know what your doing more so than me. I will say that other than regearing to 17/45 for my weight and riding environment, the oil cooler install was absolutely the best investment I've made for the Hawk.

[paulsstag]

Originally Posted by OneLeggedRider

Good old Tako, always trying to make a sale Haha! Why would I need a "first tune kit"? The only thing I could possibly need is a 112 main jet and I can get it delivered in 2 days. And the bike is running great now, so what advantage would I get from a pumper carb when I'm running a stock head? If you wanna do something useful find me a better camshaft or a head that's already been decked ported and polished with better valve springs.

That would be worthwhile buying a complete kit with updated head ,a head gasket or 2 ( one thin and one thicker ) or maybe better ,an option on which gasket you want. Not sure what all it takes to change the cam but offer a reprofiled cam with necessary gaskets and hardware.

On another note does the TT250 head come with valves and springs etc or do you have to transfer you bits from the stock head .

Hmm your idea has got me thinking, Offer it in stages such as:
#1 Ported , polished and decked head with gasket/s.
#2 A cam kit plus necessary hardware and gaskets to complete the install.
#3 All the above plus a pumper carb with a jet kit to fine tune plus a pod filter.

Maybe someone could do it on an exchange basis, or NZBL could really put together these ideas as he has access to cheap parts and possibly cheaper labor.

Just food for thought.

[JerryHawk250]

Originally Posted by paulsstag

On another note does the TT250 head come with valves and springs etc or do you have to transfer you bits from the stock head .

The TT250 head is just the head. You will have to transfer all that from the stock head. Be sure to order extra valve stem lockers. I lost one when I did my head and had to wait about a week to get one from CSC.

[paulsstag]

Originally Posted by JerryHawk250

The TT250 head is just the head. You will have to transfer all that from the stock head. Be sure to order extra valve stem lockers. I lost one when I did my head and had to wait about a week to get one from CSC.

Thanks Jerry, I've read a few times about upgraded valve springs? Are the stock ones not very good/durable or is it because people want to rev the engine higher than the stock 8500 rpms.

[JerryHawk250]

Originally Posted by paulsstag

Thanks Jerry, I've read a few times about upgraded valve springs? Are the stock ones not very good/durable or is it because people want to rev the engine higher than the stock 8500 rpms.

I don't see any problems with them. These engines aren't really design to run above 8500 rpms. That's well past the power band.

[Megadan]

Originally Posted by o2jmpr

IIRC, Megadan once posted that above 80, choke ususally wasn't necessary but probably still recommended. 60-80 was half choke range and below 60 full choke. Of course, he has his tuned to perfection I'm sure and you both definitely know what your doing more so than me. I will say that other than regearing to 17/45 for my weight and riding environment, the oil cooler install was absolutely the best investment I've made for the Hawk.

My bike is tuned in about as close as I can get it with what I have. The 45 pilot is actually just a bit too small, but it is not too lean by any stretch either. The idle mixture has to be out about 1/4 turn past 2 turns, and it has no hesitation issues under light throttle. I consider this close to a Honda factory tune for the pilot/slow jet circuit which is always a touch on the lean but safe side of things. A 48 pilot would be the ticket for me, but I await a new carb, so it is moot at this point.

The temp ranges for the choke that I gave is just a rough guideline, but you are fairly accurate. It is just another way to judge how good your idle mixture is tuned in. If you need full choke on a really warm day (above 75 to 80 degrees) with a "cold" start, then you are likely still a bit lean on the idle mixture.