Author Topic: High Performance CAMSHAFT Chain tensioner for CB750(MessnerMoto) (Read 27532 times)

underdog · « **Reply #50 on:** July 16, 2018, 04:21:11 AM »

Stan, for those of us who aren't familiar with the tensioner that you're talking about, how about a few pics or a better description?

MessnerMoto · « **Reply #51 on:** July 16, 2018, 05:50:35 AM »

Quote from: StanLipert on July 16, 2018, 03:39:25 AM

Mirko,
There should be one arc against a supporting slider between each sprocket, if possible. You have a roller changing direction in the front and back runs. How many hours at red line has you engine on it?

Bike is running from December 2017. It has almost 1500km now on clock. Rev limiter is at 10500rpm. I stopped counting how many times it was at the rev limit. Engine is a lot quieter then original and when combined with my primary chain tensioner you almost dont here chains.

If you ever reverse engineered cb750 engine you would now that it is not possible to have only one arc per side with enough curvature to eliminate harmonic oscillations of chain because chain length needs to be increased by two links. With chain length increased by two links and if only two opposing curvatures per side, chain would touch it self in the middle of cam tunnel.

If chain length is not increased by two links you cant introduce any curvature in chain guides and have chain supported in full length. I dont see a problem in middle wheel. It is needed to introduce necessary curvature. Also the only possible place to locate tensioning blade is at the holder pin for wheel in upper case. Google it and you will see similar things in modern engines... Important thing is that when cam chain is under load chain is pushing against curved guides all the way from crank sprocket to cam sprocket. That eliminates any oscillations in my cam tensioner system.

Also important thing... I am using PA 66 + MoS2 material. This will last several racing seasons. If you ever see a chain tensioner using ordinary PA 6(it is white plastic), that tensioner will not last long because PA 6 is not sutable for high temp applications and it will rapidly wear off...

PS Check out also my primary chain tensioner it is more crazy than cam tensioner. And funy thing is that it works perfectly and there is no more sound of primary chains...
Mirko

Yoshimatic · « **Reply #52 on:** July 16, 2018, 07:01:50 AM »

I really like the look of this tensioner

MessnerMoto · « **Reply #53 on:** July 16, 2018, 02:13:40 PM »

Quote from: underdog on July 16, 2018, 04:21:11 AM

Stan, for those of us who aren't familiar with the tensioner that you're talking about, how about a few pics or a better description?

I think Stan was taking about this tensioner. KA tensioner sold by M3 racing if I remember correctly.

If you read this topics http://forums.sohc4.net/index.php/topic,150140.100.html you will see that people had big problems with this KA tensioner.

Look at the second picture it has a rapid wear... Read the several post in link above from people who used this KA tensioner, not a good experience....

cbr954 · « **Reply #54 on:** July 16, 2018, 08:14:58 PM »

I had issues with that tensioner as well, the problem gets worse when you mill the head, the chain only makes contact on a very small portion of the slider material.

MessnerMoto · « **Reply #55 on:** July 25, 2018, 06:45:09 AM »

Just small update. I have all the parts for assembly. I will start shipping soon in several days

slikwilli420 · « **Reply #56 on:** July 25, 2018, 06:56:51 AM »

Excellent!!

bwaller · « **Reply #57 on:** July 25, 2018, 01:21:14 PM »

Pretty damn sweet.

MessnerMoto · « **Reply #58 on:** July 30, 2018, 03:22:42 PM »

This is one complete kit, chain does not go with the kit

But you get

1. CNCed back slider made from PA 66 + MoS2 plastic with laser cut stainless steel support plates
2. CNCed tensioner made from PA 66 + MoS2 plastic with laser cut stainless steel support plates
3. CNCed middle wheel made from PA 66 + MoS2 plastic with NTN HK1312 high speed needle bearing
4. One fancy nitrated axel for middle wheel, hardened to 55RC
5. One Aluminum 8mm diameter pin. Sides of this pin are CNCed so it slides in upper hole of cylinders
6. One 6mm steel pin
7. This kit is hand assembled and riveted

You need this chain for this to work:

https://www.ebay.com/itm/CATENA-DI-DISTRIBUZIONE-DID-219FTH-96M-HUSQVARNA-350-TE-1990-1998/351761127274?epid=1658174043&hash=item51e698d76a%3Ag%3A8GcAAOSwzgRWua%7Ep&_sop=15&_sacat=0&_nkw=did+219+fth+96&_from=R40&rt=nc

It is DID 219 fth 96 links HD cam chain with two extra links(OEM is 94 links). It is endless but comes open with link that need to be riveted

Final price is 160EU

Shipping is 8EU for hole world(I checked for several countries from all over the world and it is always 8EU, maybe there is an exception...)
It is airmail with tracking number/info.... You should not pay import taxes but maybe there will be some exceptions....

The hole price is 160 + 8 = 168EU or by current rate 197USD You can choose EU or USD....

This is low margin for profit. I can't afford PayPal fee. If you want to pay like you are buying product I need to include also PayPal fee 5%.

Enjoy

slikwilli420 · « **Reply #59 on:** July 30, 2018, 03:42:19 PM »

I'm in. Please send payment info and total without PayPal fees.

754 · « **Reply #60 on:** July 30, 2018, 05:00:58 PM »

That sounds pretty reasonable..

MessnerMoto · « **Reply #61 on:** August 01, 2018, 07:59:35 AM »

Quote from: 754 on July 30, 2018, 05:00:58 PM

That sounds pretty reasonable..

thats understatement

SOHC4 Cafe Racer Fan · « **Reply #62 on:** August 01, 2018, 11:30:49 AM »

No if only you made one for a 650 . . .

simon#42 · « **Reply #63 on:** August 01, 2018, 12:28:01 PM »

that is a good price , well done

Cb750 Racer · « **Reply #64 on:** August 01, 2018, 06:21:54 PM »

Quote from: MessnerMoto on August 01, 2018, 07:59:35 AM

Quote from: 754 on July 30, 2018, 05:00:58 PM
That sounds pretty reasonable..

thats understatement

Dam you work quick! looks good cant wait to test mine out

Yoshimatic · « **Reply #65 on:** August 02, 2018, 03:52:42 AM »

I will get one please, I will PM you.

turboguzzi · « **Reply #66 on:** August 10, 2018, 12:05:26 PM »

Quote from: SOHC4 Cafe Racer Fan on August 01, 2018, 11:30:49 AM

No if only you made one for a 650 . . .

until mirko gets around to design one for the 500/550/650, you can use my solution

http://forums.sohc4.net/index.php/topic,55162.msg593605.html#msg593605

MessnerMoto · « **Reply #67 on:** August 23, 2018, 02:08:07 AM »

Cam tensioner went to all parts of the world! It is time to write some installation info. I will compile it in PDF and send it to all.

Tensioner should go in like OEM one but there are some things to pay attention to

Installation tip 1.

When you are assembling the engine(cylinders, piston, head...) it is important to have the chain always tightened like in OEM cam tensioner installation.

But it is more important for this cam tensioner than for OEM, because if "kink" on chain happens (look at the picture) and you have tightened the head you will not be able to turn the crank/engine. If this happens you need to untighten the head and lift the cylinders from upper case a little bit to release the kink. Don't try to force the chain to release the kink by force turning the crank.

Medyo Bastos · « **Reply #68 on:** August 23, 2018, 03:57:48 PM »

Got mine, ‘preciate it

Sent from my iPhone using Tapatalk

MRieck · « **Reply #69 on:** August 24, 2018, 06:16:45 AM »

Quote from: MessnerMoto on August 23, 2018, 02:08:07 AM

Cam tensioner went to all parts of the world! It is time to write some installation info. I will compile it in PDF and send it to all.

Tensioner should go in like OEM one but there are some things to pay attention to

Installation tip 1.

When you are assembling the engine(cylinders, piston, head...) it is important to have the chain always tightened like in OEM cam tensioner installation.

But it is more important for this cam tensioner than for OEM, because if "kink" on chain happens (look at the picture) and you have tightened the head you will not be able to turn the crank/engine. If this happens you need to untighten the head and lift the cylinders from upper case a little bit to release the kink. Don't try to force the chain to release the kink by force turning the crank.

I received my 2 pieces....thank you. good tip too.

kmb69 · « **Reply #70 on:** September 05, 2018, 08:01:47 AM »

Just received mine. Thx
If they work as good as they look, you have a real winner!

MessnerMoto · « **Reply #71 on:** September 05, 2018, 10:56:40 AM »

Hopefully somebody will soon start using one

CBJoe · « **Reply #72 on:** September 17, 2018, 02:27:19 PM »

Hi Mirko...I got mine in the mail today! Thanks much. Unfortunately I wont be much help as I don't have a reason to take the engine down yet. But when I do it'll be going in.

Sorry for stupid question...but this uses the stock tension adjuster yes?

Cheers, Joe

MRieck · « **Reply #73 on:** September 17, 2018, 02:52:55 PM »

Quote from: MessnerMoto on September 05, 2018, 10:56:40 AM

Hopefully somebody will soon start using one

I'm waiting for the proper riveting tool.....won't be available until 9/20

jus4selling · « **Reply #74 on:** September 17, 2018, 10:47:24 PM »

Looking forward to the feedback from those of you installing these.

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Author Topic: High Performance CAMSHAFT Chain tensioner for CB750(MessnerMoto) (Read 27532 times)