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  Topic Review (Newest First)
01-18-2019 06:53 AM
CAM2
Re: Condition of clutch

Quote:
Originally Posted by Chrisi View Post
the next step in the modification of the china clutch, is to cut a m 4 thread in the base plate at the side of the arms of the clutch in order to install small m 4 worm screws there. So you can adjust the distance of the coupling arms. The diameter of the Chinaclutches is usually 75-77mm and that is not enough for a good function. The best performance is achieved with 0.5 - 1mm distance to the bell and it can also be compensated for the wear without a small bell.
I found it takes a keen balance to dial them in...

A larger gap requires lighter spring pressures.It also allows the power to hit alot harder from a dead standstill aswell as midrange punch.......

Once youve mastered the formula between diameter size,spring type and clutch arm weight alls you have to do is keep replicating it over and over.


I know guys who will run a clutch a certain amount of race heats then swap out for another new clutch then the half worn clutches are reworked to operate flawlessly on its decline to maximize clutch life.
01-15-2019 01:53 PM
Chrisi the next step in the modification of the china clutch, is to cut a m 4 thread in the base plate at the side of the arms of the clutch in order to install small m 4 worm screws there. So you can adjust the distance of the coupling arms. The diameter of the Chinaclutches is usually 75-77mm and that is not enough for a good function. The best performance is achieved with 0.5 - 1mm distance to the bell and it can also be compensated for the wear without a small bell.
01-11-2019 08:58 PM
CAM2
Re: Condition of clutch

Quote:
Originally Posted by EPR View Post
A new C1 clone clutch is $20 or less. You can put Blata or Polini springs on your clone clutch
The same deal with the cag clutches applies with the clone rep parts aswell.

if you disassemble the clutch and weigh each arm seperately youll see weights that differ alot more than the acceptable weight limits between the heaviest and the lightest,

Problem is the chinese metallurgy...Its not entirely exact when they make their alloys so the weights differ because of this.

Another thing to note if it hasnt been covered already is pre-baking the clutchpads to fully cure the adheisive bonding that secures the pad to the shoe.

Before you reassemble the clutch it would be wise to change the clutch housing bearing plus take 80-100 grit sandpaper to deglaze aswell as roughen the bell.


Any old pad material glazed onto the drum will make faster destruction of your new clutch than normal.
01-09-2019 03:05 PM
EPR
Re: Condition of clutch

A new C1 clone clutch is $20 or less. You can put Blata or Polini springs on your clone clutch
01-07-2019 11:39 PM
MrKitty that's awesome I bet they rip...
01-07-2019 10:57 PM
EPR
Re: Condition of clutch

I have a 50cc W/C C1 ( Blata clone ) and 39cc air cooled Blata engine in a C1 water cooled frame, and 50cc Banshee Sho ( Polini W/C ) in an alum frame chrome plated clone of my Italian GRC GP BZM powered Euro bike.
01-07-2019 12:20 PM
Maird79 Ive gone with 55mm that should do the trick.Thanks👍
Same length for the 3 alan screws aswell?
01-07-2019 12:15 PM
Maird79 I'm sure it's a rep
01-07-2019 12:39 AM
Chrisi 50-60mm is long enough
01-06-2019 11:20 PM
EPR
Re: Condition of clutch

You need lock nuts on the adjustment screws to keep it from turning. I would get new springs there under $20, and I would grind half the alum lips down to give you more pad thickness so it down hit the bell. Take the clutch & arms off to modify and clean everything, any decent hardware has metri nuts & bolts. You can buy just the clutch arms w/ pad in a set. BZM has clutches for it too. On my GRC GP avatar photo I found a new $175 BZM racing clutch for $68, I snapped it up so fast, lol. This is a real B1 Blata right??
01-06-2019 06:35 PM
Maird79 What's the length in mm
Of the middle hexagon screw
01-06-2019 05:36 PM
CAM2
Re: Condition of clutch

Quote:
Originally Posted by Maird79 View Post
Thanks 👍
Oh and you dont have to weld the nut...just hold the nut with a box wrench and turn the bolt.
01-06-2019 05:15 PM
Maird79 Thanks 👍
01-06-2019 05:03 PM
CAM2
Re: Condition of clutch

Quote:
Originally Posted by Maird79 View Post
Hopefully once I blowtorch and liquify the loctite it should come off🙏
Quote:
Originally Posted by Maird79 View Post
Hi
Thanks for the diy clutch guide. Hope I got it right. What length in mm do the 3 bolts need to be



Long enough to make contact with the crankcase but theres a huge risk to doing it wrong which is a cracked case..

Heres what Id do if i had to go that route.,,,

Put descent even pressure on all 3 screws then hit the crank snout end til it gets to around 150-160 degrees or you hear the clutch mount pop from the crank.

If no pop give the center screw some more pressure and that should get it to release while being held securely..

Those engines run up to 230 degrees aircooled and 200 watercooled to give you an idea on the kinda indirect heat the seal can take....

you can also do it with shorter screws just enough to hold the plate but then you need something to stop the crank from spinning...


Good Luck
01-06-2019 04:57 PM
Maird79 Hopefully once I blowtorch and liquify the loctite it should come off🙏
01-06-2019 04:53 PM
Maird79 Hi
Thanks for the diy clutch guide. Hope I got it right. What length in mm do the 3 bolts need to be
01-04-2019 11:21 PM
EPR
Re: Condition of clutch

The B1 / C1 clutch is on a straight shaft with key, it should be pretty easy to get it to slide off. I use 3 in 1 oil in a little squeeze can, on everything, cylinder, piston, bearings and seals when I am rebuilding. I over heated my C1 clutch and a pad came off and wedged its self between the other pad and bell, I though I blew it up at first.
01-04-2019 12:41 PM
CAM2
Re: Condition of clutch

Quote:
Originally Posted by Maird79 View Post
Which type of lubricant do you use in the oiler pen to lube crank seals. Thanks
I use Cerflon.Its a wet Teflon with ceramic that dries and stays where its put and doesnt collect clutch dust like 2 stroke oil does and its twice as slick too...........

Cerflon ? Cerflon ? Ceramic Reinforced Fluoropolymer

Another thing I use is Next Dimension white graphite.Its a chain lube sold by most Honda dealerships..It works excellent on chains too..Way better than chain wax.
01-04-2019 09:29 AM
Chrisi Cut 3-threads, turn screws's into like on the pic, when screw's hit the crankcase the turne them only a step, then the next and so on. So can get it off for the first time

For the first run give the oilseals some 2 strokeoil and thats it.
01-04-2019 09:06 AM
Maird79 Which type of lubricant do you use in the oiler pen to lube crank seals. Thanks
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