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Discussion Starter #1
So I took a picture of the flat chain on the Yuminashi arm and I guess most users are concern that the flat chain is not riding between the channel, as you can see in my pic that the chain is riding on the two edge of the guide wall. Solution one is to cut the two side walls down to the thickness of the dyron, which means no side walls.
IMG_5223 copy.jpg

I will do a test fit and see how the flat chain rides and see if maybe I should just cut one side wall at lease to have some guide for the chain using the other wall. So many DIY options.

Since no one has used this Yuminashi arm I was thinking to myself what if the chain is so pose to be mounted like this or rides in the channel like this.
IMG_5224 copy.jpg


What Yuminashi should have done to fix this problem was to have done a center guide wall running the length of the arm, this would solve the chain from moving left or right and test fit these arms for either a stock 2v head or a BBK kit 4v head.

For me I thing I will machine one of the arms that I bought to remove both side walls and adjust the tip that goes into the head so the chain does not come off at a steep angle going onto the arm. I might try to put the wheel that goes into the cylinder channel as the guide for the flat chain so it will not try to go side to side when the engine is running.

DIY or bust.
 

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I sent them an email with this picture, and asked if they could send me the correct part... this is what I got in return.

F*** these guys and Yuminashi as a whole. Hopefully people see this and steer clear of them.


Sent from my SAMSUNG-SM-G935A using Tapatalk
 

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Discussion Starter #4
so they sell a cam chain tensioner that doesn't work with the cam chain they sell. lol. man oh man...
there's no online how to install and the parts seem to be either miss-match or designed wrong for BBK kit 4v engine. Most of the parts was designed for stock heads with 2v.

just looking at some of the design work looks like someone either miss-measured some parts.

Contacted Yuminashi via email and I guess they either don't understand English or don't know how to use the translator function.
 

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Wow, I'm actually glad I pulled these items of of my cart at the last minute on my last purchase through them. I did get their idler wheel for inside the cylinder to add to my GF manual tensioner and new stock chain.
 

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like i said, i will -never- trust hardware from there ever again, got burned once already. that tensioner probably wont fit a stock chain either. plate width should be the same regardless of if its their chain or not.(or damn close)... i *think* its a 210 series chain.
 

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Discussion Starter #7
yep if they "yuminashi" just got rid of the two side walls and had a center strip down the whole length of the arm it would work. Even when contacting Yuminashi they seem to don't respond to customer concern.
 

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Since no one has used this Yuminashi arm I was thinking to myself what if the chain is so pose to be mounted like this or rides in the channel like this.
View attachment 80144
I've been running this for over 500-600 miles now on my stock bore 2v. I told you in the past TWO threads you posted about this.

I've noticed a lot of the recent chain guides he's been selling have been different than the one I received early on because my chain actually fit. Dipshit probably started buying a cheaper one to resell at the same price hoping no one would notice. Once again, Yuminashi doesn't make these.. ProjectFI thailand does. If you order from them you can get the correct part they actually make for MSX, but communication might be a barrier.

Glad I haven't had these issues everyone else has... Owner of Yuminashi is a total assbag.
 

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Discussion Starter #9 (Edited)
I've been running this for over 500-600 miles now on my stock bore 2v. I told you in the past TWO threads you posted about this.

I've noticed a lot of the recent chain guides he's been selling have been different than the one I received early on because my chain actually fit. Dipshit probably started buying a cheaper one to resell at the same price hoping no one would notice. Once again, Yuminashi doesn't make these.. ProjectFI thailand does. If you order from them you can get the correct part they actually make for MSX, but communication might be a barrier.

Glad I haven't had these issues everyone else has... Owner of Yuminashi is a total assbag.
Greatly appreciate the heads up on the company that sells the correct part.

By any chance do you have a picture showing how the flat chain should be riding on the cam tension, is it riding between the two walls and in the channel!!!??

I think for my first test is to remove the side walls via sanding it down and adjust the pitch angle as it comes off the cam sprocket so it is at a better angle. It will sort of look like my cam guides that I have on my hayabusa engine once I get it DIY modded.
 

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I'd install that right into the trashcan where it belongs. if you are able, measure it out, cad it up, and have it laser cut out a of a length of delrin.
 

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well, the ecm was made by keihin (the oem mfg of the stock one), thats the -only- reason i bought one. its good. the 1st gen ones were like an api unit. :/
 

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Discussion Starter #13
After seeing this thread I'm even happier that I didn't get sucked into the Yuminashi ECM.
I think some users of the Yuminashi ECM are having good luck with those Stand Alone ECM.

As far as the Yuminashi cam chain tensioner that is a different story.

Both of my Takegawa 181-4v BBK kit groms are using the Yuminashi 10 hole F/I with Zero issues.
 

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well, the ecm was made by keihin (the oem mfg of the stock one), thats the -only- reason i bought one. its good. the 1st gen ones were like an api unit. :/
I think some users of the Yuminashi ECM are having good luck with those Stand Alone ECM.

As far as the Yuminashi cam chain tensioner that is a different story.

Both of my Takegawa 181-4v BBK kit groms are using the Yuminashi 10 hole F/I with Zero issues.
Yeah, but if there was an issue with the ECM or if you need support it's apparent that you're out of luck. I've contacting them and their Changlish was horrible. They don't understand what you are saying and their responses don't make sense. And this thread shows they make junk and you like it the way they made it or too bad. Bad customer support sucks and I'd rather avoid that mess.
 

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True. i went into this knowing this. Again, how are they going to support an ecm? theres no inputs. just a custom flashed one they had keihin do for them. however, having a chain tensioner come apart in a motor is a much scarier situation IMHO, especially if they are changing suppliers mid run, thats super sketchy shit.

dig back, you'll see wayyyy early on i had a yuminashi piston fail on me, and they ran me around for months over it. again, never again with their engine hardware(very much to your point). its all garbage.
 

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Greatly appreciate the heads up on the company that sells the correct part.

By any chance do you have a picture showing how the flat chain should be riding on the cam tension, is it riding between the two walls and in the channel!!!??

I think for my first test is to remove the side walls via sanding it down and adjust the pitch angle as it comes off the cam sprocket so it is at a better angle. It will sort of look like my cam guides that I have on my hayabusa engine once I get it DIY modded.
yes, it's between the two "walls" in the channel but no picture as I didn't expect this kind of issue to come up like the rest of you guys lol. Next time I open it up I'll try and get a picture for everyone.
 

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True. i went into this knowing this. Again, how are they going to support an ecm? theres no inputs. just a custom flashed one they had keihin do for them. however, having a chain tensioner come apart in a motor is a much scarier situation IMHO, especially if they are changing suppliers mid run, thats super sketchy shit.

dig back, you'll see wayyyy early on i had a yuminashi piston fail on me, and they ran me around for months over it. again, never again with their engine hardware(very much to your point). its all garbage.
I'm saying if you got a defective ECU and they were trying to troubleshoot via emails. They'd probably give you the Changlish run around which it what it sounds like you got.
 

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After seeing this thread I'm even happier that I didn't get sucked into the Yuminashi ECM.
No issues with my ECM and a m_in_sc said, its a Keihin ECM. I've been running it for a week now and it is a better setup with my PCV/WB2 than the stock ECM was.
 

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trouble shoot what? its a 75 dollar ecm. if it took a shit id just put the stock one back on since i run it with a pcv/wb02. I -never- expect product support from over seas, just reality. there's basically zero accountability from pretty much any company that far away w/out a us distributor. to get support you usually need to pay, like hard racing and the pcv and wb2 support, or mmtbx with the bazazz. premium but guaranteed support. usually 'cheap' and 'product support' do not go hand in hand at all. DHM is the exception here.
 

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trouble shoot what? its a 75 dollar ecm. if it took a shit id just put the stock one back on since i run it with a pcv/wb02. I -never- expect product support from over seas, just reality. there's basically zero accountability from pretty much any company that far away w/out a us distributor. to get support you usually need to pay, like hard racing and the pcv and wb2 support, or mmtbx with the bazazz. premium but guaranteed support. usually 'cheap' and 'product support' do not go hand in hand at all. DHM is the exception here.
I've dealt with many overseas companies that do stand behind their products. It's all about the quality of the company.
 
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