Cb160 Carburetor troubles
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Thread: Cb160 Carburetor troubles

  1. #1
    Junior Member big pete's Avatar
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    Cb160 Carburetor troubles

    Hi all,can anybody tell me if the pilot jets which which come in the Keyster kits are any good ?.I am beginning to think that the only part that works with these kits is the box that it came in .What is the overall length of the jet (size 38 ) as I have seen on the web that the length is wrong .I have tried to buy genuine jets but it seems nobody has any in uk .Thank you .Pete

  2. #2
    Senior Member ancientdad's Avatar
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    It's a problem Pete - we've come to never trust the jets supplied with aftermarket rebuild kits, best to clean and re-use your original jets if possible. The kits (depending on brand, of course) aren't all bad, but the jets and often the float needles can't be trusted. Looks like cmsnl.com has them (at least some sizes)

    https://www.cmsnl.com/honda-cb160-sp...l#.XPrSPxZKi00
    Tom

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  3. #3
    Senior Member Richard_Pitman's Avatar
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    I rebuilt a pair of CB200 carbs using a Keyster kit. I was reassured to see 'Made in Japan' written on the box.

    This kit had #38 pilot jets in it, and they appeared identical to the original Keihin ones, external dimensions at least. Same went for the #88 main jets. Rebuilt carbs worked as expected ( when fitted to my CL175 ).

    The float needles and seats were a different story, needles were too 'fat' for the seats, kept hanging up. Resolved by using Keyster seats and existing Keihin needles.

    Overall, I'd say that the Keyster kits are much better than the 'Rusty Riders' kits which I've also tried and discarded.
    chaindrivecharlie likes this.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

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  5. #4
    Senior Member TOOLS1's Avatar
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    I have not had any trouble with the jets on the 160 carb kits, but the pilot screw, idle screw, and rubber parts now that is a whole different story. Those parts were not machined to factory specs and the O-rings would not seal and created vacuum leaks. Used Honda parts and no more problems.
    TOOLS

  6. #5
    Junior Member big pete's Avatar
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    Thank you all for your reply's .A common comment seems to be do not use the needles or float gaskets _ float valves or o rings When i bought the bike it must have already had a refurb kit fitted ? as all the parts from my new kit appear to be the same . With the kit fitted it used to flood all the time,cured by buying genuine Honda float valves ,with the needles from the kit it would hardly run and pumped fuel out of the exhaust, cured by fitting genuine needles .As i do not seem to be able to get a reliable tick over I naturally suspect the pilot jets, but as i said in my first post i can not seem to find anybody with genuine size 38 jets in stock Cheers Pete

  7. #6
    Senior Member ancientdad's Avatar
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    If it were mine and I was in your position, I don't think I'd be too concerned about the difference between 35 and 38 - since you're obviously having trouble finding them. cmsnl.com has 35s though their prices are somewhat high, but considering the jets are bordering on unobtainium I think I'd buy them and try to make adjustments for the slight difference in leanness

    https://www.cmsnl.com/honda-cb160-sp.../#.XP01WRZKi00
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  8. #7
    Senior Member tbpmusic's Avatar
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    Especially do not trust the slide needles provided - they're super-critical to get right, - particularly on models with no slide needle adjustment.
    Bill Lane
    Honda Twins Founding Member

    No advice, just info

    '75 CB200T, '71 CB450 K4 Half-Breed, '72 CL350 (Sold), '81 CM200T, '72 C70M
    and a little red Chineeze scooter

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  9. #8
    Senior Member Richard_Pitman's Avatar
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    As i do not seem to be able to get a reliable tick over I naturally suspect the pilot jets
    Are you absolutely 100% certain that the carbs are completely clean ?

    There have been quite a few folks on here, myself included, who were certain that they had cleaned their carbs thoroughly but still had idle issues. One guy resorted to threading guitar strings through the passage ways, I junked my cheap jewellery cleaner and bought a proper ultrasonic bath, along with specific carb cleaner. Amazed at the muck that fetched out of a 'clean' pair of carbs.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

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