1. Why do you use Viton® for your o-rings and seals?
  2. Can I just buy these o-rings at my local suppler?
  3. Can I just buy the parts that are in the carb kits separately?
  4. How do I buy online?
  5. I placed my order. When will I receive confirmation?
  6. When I click the "Add to Cart" button it takes me to the PayPal cart page, but it is written in Thai.
  7. How do I know if the item I want to buy is in stock?



  1. Why do you use Viton® for your o-rings and seals?
    For the simple reason that it is the best product to use. Tests have shown that Viton® has a high resistance to permeation and chemical attack by alcohol, pure ethanol, and blends of ethanol with hydrocarbon fuel. It is also resistant to stale fuel, UV light and has a longer shelf life.

    Here is the best research that we have been able to find on the comparisons between various elastomers and ethanol blend fuels; Intermediate Ethanol Blends Infrastructure Materials Compatibility Study: Elastomers, Metals, and Sealants Viton is a fluorocarbon, and all of the standard seals in motorcycle carburettors are NBR, with the possible exception of the float needle which usually has a Viton tip (funny that). If you do not want to read it all, this is from the summary.

    5.2.1 Fluorocarbons
    Fluorocarbons yielded the lowest decrease in physical properties of the elastomers tested in this study. The addition of ethanol did not drastically affect the measured properties, and the eight fluoroelastomers exhibited only modest swell and softening (wet hardness decrease) upon exposure to the test fuels. The specimens swelled to around 20%, which is considered the upper limit for many sealing applications. Likewise the fluoroelastomers did not experience shrinkage and mass loss at the dried condition, nor did they become embrittled. . . . ..

    5.2.5 NBR
    The eight NBR samples (and polyurethane) showed a pronounced increase in volume swell and softening when exposed to fuels containing ethanol. Exposures to Fuel C resulted in volume expansion approaching 20%. When exposed to the ethanol-blended test fluids, the NBRs swelled by more than 30%. Likewise, the hardness values dropped an additional 10 points when ethanol was added to the test fluid. When all of the samples (including Fuel C exposures) were dried, 8% to 14% of the mass was lost and the accompanying shrinkage was between 10% and 18%. The dried hardness was increased 5 to 16 points, indicating that embrittlement had occurred. NBR was one of only two elastomer types (the other being neoprene) that exhibited significant embrittlement in the dried state, indicating that plasticizer components were being removed by the test fuels. . . . .

    embrittlement
    On the left is a new jet housing seal for a Mikuni BDST carburettor made from Viton. On the right is an OEM seal made from NBR that is suffering from embrittlement.

  2. Can I just buy these o-rings at my local suppler?

    No, almost all of the o-rings used in Mikuni and Keihin carburettors are proprietary sizes.

  3. Can I just buy the parts that are in the carb kits separately?

    No

  4. How do I buy online?

    Goods can be purchased by using the PayPal add to cart button or you can pay with WebMoney. To pay by WebMoney contact us with a list of the products that you want and we will send you an invoice. In most cases shipping is free and is by registered airmail. If you would like a different service then you will have to pay for the difference in cost.

  5. I placed my order. When will I receive confirmation?

    We usually ship within one business day of receiving your order. A confirmation email is sent at that time. If you have not received it then please check your spam folder as email from Asia is often treated as spam. Please email us directly if you have not received your confirmation. Email details are on the contact page.

  6. When I click the "Add to Cart" button it takes me to the PayPal cart page, but it is written in Thai.

    Our web site is written in English and hosted in the USA. The PayPal web site is controlled by PayPal, not us. In response to this issue PayPal replied.

    Yes, if you don't set the locale code, the language will be displayed by the customer's browser setting. If they didn't set the language for their browsers, the default language is US. To avoid incorrect language displayed, please ask your customers to set the preferred language in their browsers. How to set the language for IE, i searched one guide for your reference: Change your Internet Explorer language settings

    If you are still having problems then please contact us and we will help you to solve this issue.

  7. How do I know if the item I want to buy is in stock?

    If you can see the "AddToCart" button for the item that you wish to buy, then it is in stock.








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