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Old 25th October 2016, 10:35   #121
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Default Re: Yamaha RD 350 - A travail on its 17th Year

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Originally Posted by ku69rd View Post
That's one good looking RD you have in your garage mate...congrats she is a good looker.

Regarding the Carbs, I would suggest you to avoid the Flat Slide carbs for city usage since their mid range will not keep you happy. They are trigger happy and tuning them is always a challenge to keep all the three parameters under control (Initial/Mid range and top end).
Instead of Mikuni 28TM please buy the Mikuni VM28SC which came with the bike. They give you a very good all round performance and are lighter on the pocket as well.

Do keep us posted on this thread more.

PS: Why have you put a balancer pipe? Original RD's never came with it.

Thanks a Lot Mahesh for the compliments, yup the build is now 8 months old...hopefully i'll be able to maintain it this way for sometime.

Regarding the TM-28, I test drove an RD with that it had UNI filters too, the performance was breathtaking.....
Will do a research on that and keep you posted on the mods that I do.

I did not understand the balancer pipe u were referring to....
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Old 25th October 2016, 10:39   #122
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Default Re: Yamaha RD 350 - A travail on its 17th Year

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Originally Posted by r_nairtvm View Post
Mahesh,

I think the Carbs he is using is not having the interconnection between them and hence use of this external ones through the inlet, I think.

I have seen this done on many

Is VM28SC available anywhere ?

Best Regards & Ride Safe

Ram
Hi Ram Sir,

The carbs are available in US, and can buy it from Ebay, if anyones coming maybe can ship it to that address, or an address somewhere in UAE, direct shipping will attract duties.....

http://www.ebay.com/itm/MIKUNI-VM-RO...pXljWK&vxp=mtr
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Old 26th October 2016, 14:59   #123
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Default Re: Yamaha RD 350 - A travail on its 17th Year

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Originally Posted by wheelz View Post
Hi Ram Sir,

The carbs are available in US,
http://www.ebay.com/itm/MIKUNI-VM-RO...pXljWK&vxp=mtr
I am researching it with experts if VM28-49 is same as VM28SC which was the Indian Spec RD 350.

Thanks any way

Best Regards & Ride Safe

Ram
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Old 26th October 2016, 15:17   #124
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Default Re: Yamaha RD 350 - A travail on its 17th Year

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Originally Posted by r_nairtvm View Post
if VM28-49 is same as VM28SC which was the Indian Spec RD 350.
Chief,
You have any link to this VM28-49? Would be interesting to read this.
From my understanding if the throttle slide body and Venturi match it should be a straight fix.
Jetting can be done to meet the requirements by any expert tuner.
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Old 29th October 2016, 11:05   #125
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Default Re: Yamaha RD 350 - A travail on its 17th Year

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Originally Posted by ku69rd View Post
Chief,
You have any link to this VM28-49? Would be interesting to read this.
From my understanding if the throttle slide body and Venturi match it should be a straight fix.
Jetting can be done to meet the requirements by any expert tuner.
Mahesh,

I am talking to few of my friends. Will update as soon as I know. The interconnection point is missing I think (what's your view on this ? - is it critical ?)
Apparently Mikuni has brought it back in to production after several years.

Specs are as follows;

The Mikuni VM28-49 is supplied with the following factory jetting installed:

Pilot jet 60 (VM22/210), Needle 5F21, Needle Jet N-8 (169 Series), Main Jet 200 (4/042), Air Jet 0.5, Slide Cutaway 2.5 (VM28/56), Needle valve 3.2 (VM26/26)

Mikuni VM28-49 Dimension A= 35mm, B= 93mm, C= 125mm, D= 44mm, Total Width= 83mm

See pic below as well

Name:  Mikuni.jpg
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Size:  64.1 KB

Best Regards & Ride Safe

Ram

Last edited by r_nairtvm : 29th October 2016 at 11:08.
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Old 2nd November 2016, 17:33   #126
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Default Re: Yamaha RD 350 - A travail on its 17th Year

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Originally Posted by r_nairtvm View Post
Mahesh,

I am talking to few of my friends. Will update as soon as I know. The interconnection point is missing I think (what's your view on this ? - is it critical ?)
Ram
Hello Ram,
Thanks for posting in the details. The inter connection is a critical part as it runs the choke for both bikes. In cold starts you will have a challenge since one cylinder will fire and the other might not. Prolonged usage will lead to one connecting rod getting worked more than the other since the pressure will be high. Chances of losing the right balance will be high in such scenarios.

Till we get one on hand and observe them in detail, cannot say with conviction that this will be the best fit for the RD.

The balancer pipe between the two reed valves also will not solve the problem. That is generally put to balance the slight variation in the air-fuel mixture and nothing else. Done by tuners who might not be confident of giving a 0-0 balance. Also if you were to look at it...the health condition of the two cylinders will vary and there will be at times where one cylinder might need a slightly richer tune than the other. So the balancer pipe negates these flexibility.
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