Brozz 250 - 4 Degree Timing Key Install

[Megadan]

Originally Posted by grumpyunk

Have you seen the 'performance cam' listed on DaBay?

here:
UPGRADE Cam for HONDA CG125 Chinese 150/200/250cc Push Rod Engine ATV Dirt Bike | eBay

Looks as if they just picked one up from the maching and didn't even give it a bath.
But it does have the 'fat' shape that will give longer duration. At least my eyes tell me so. Mega you should get one and compare to what you got from Brazil to see if the grind is somewhere close. Should be informative. And appreciated by all interested in this stuff.
tom

I would rather buy my cam from a source that at least has a good reputation, even if it costs me more. I bought a WGK cam because they are a known good product with a good track record. If somebody else wants to give that a try, then feel free. You could simply order a standard cam at the same time and compare the two when they arrive.

[tknj99]

Just placed an order for the key here: https://adaracing.com/timing-adjustm...e-honda-crf50/
and puller: https://www.amazon.com/gp/product/B0...34AEN231&psc=1

Thanks guys, will update the thread hopefully with successful results on next attempt

[grumpyunk]

tk, the puller is just a bolt. a nice bolt. with a big head. you will need threads in the inner diameter of the flywheel for the puller to work. if your threads are damaged, you have several choices. there are 'thread chasers' that will clean up partially damaged threads. a tap can be used of the proper size & pitch, but some say it may remove more metal.
either way, good luck.
tom

[tknj99]

Thanks.. im going to try the puller bolt with the existing threads and hope it works.
I plan to remove the flywheel bolt, then insert the puller bolt and try to torque it to prob 30 or so foot pounds by feel once it seats against the crankshaft end.
Then from what you guys have said and also read in a comment for this puller that once its torqued and under stress, i will take my socket wrench off of the end of the puller and hit the puller head with a metal hammer hard until the flywheel falls off.
Ive read that is the recommendation for stubborn flywheels which im certain mine is.
Hopefully it works, otherwise ill look into buying a tap to fix the threads on the flywheel as next steps..
I feel pretty determined to get this done, some extra torque on the bottom end would definitely be a nice compliment to the existing performance work.

[TxTaoRider]

Just installed the 4 degree key. Easy peasy, took about an hour. I'll test it out tomorrow.

[tknj99]

Update: my part deux also ended in disappointment.
I screwed the puller against the crankcase end with a decent amount of torque and then hit it with a 2 pound hammer and nothing.. Few more times, nothing.. I also torqued the puller after each attempt..
Last tries were with a 4 pound sledge hammer banging against the puller head and no go..
In the end the flywheel threads became jello..
So I buttoned everything back up but this time also added gasket maker to the edge of the case to make it seal better and locktite the cover bolts.
My guess is that the flywheel is seized on the crank, perhaps heating up the flywheel, retapping the threads or cutting it off would all be viable solutions but im going to move on for now and enjoy the power I've got her to currently with the mods.
Thanks all for bearing with me thru this ordeal, was a learning experience as they all are. Hopefully my case winds up as the rare exception and everyone else has positive experiences with this.

[China Rider 27]

Sorry to hear. I would try an outside flywheel puller before I threw in the towel. You can rent them at auto parts stores. You will have to clamp a strap around them to keep them from sliding off. Depending on the end of the screw, maybe something screwed into the retainer bolt to push against.

[tknj99]

Originally Posted by China Rider 27

Sorry to hear. I would try an outside flywheel puller before I threw in the towel. You can rent them at auto parts stores. You will have to clamp a strap around them to keep them from sliding off. Depending on the end of the screw, maybe something screwed into the retainer bolt to push against.

Thanks, forgot about that option, I think I'll hold off for now and possibly look to do that at the next 1k oil change mark, as an potential upgrade to look forward to

[TxTaoRider]

Ok just my seat of the pants observation: this is a good upgrade. It revs faster, and for the 1st time I was able to lift the front tire (not allot, just a few inches). So for 30 bux (including the key and the tool), it's worthwhile.

[tknj99]

Did you feel that the torque was most improved on the bottom end? That's what I heard of it

[TxTaoRider]

Originally Posted by tknj99

Did you feel that the torque was most improved on the bottom end? That's what I heard of it

Actually it feels stronger across the board from top bottom. It's not a fire breathing dragon, but its noticable.