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Thread: Question(s) regarding Yamaha RX100 engine overhaul

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    Default Question(s) regarding Yamaha RX100 engine overhaul

    Hey guys!

    I am going to embark on a massive engine overhaul starting tomorrow. I am going to get the cylinder rebored from a very reliable rebore guy in my city, get the crankshaft repaired, new bearings etc etc you know the usual? The thing that has been bugging me is that my mechanic says once the engine has been hauled over I should run it on 2 times the amount of 2t oil I normally would for the first 1000 kilometers, does this make any sense? At least to me it didn't :s Coming over to my second gripe somebody stole my rexy's silencer muffler (you know the mesh like thingy inside the silencer, Yes! somebody was crazy enough to steal it!) so I bought this new muffler and my motorcycle has lost the signature 'dib dib' it sounds muffled now more like somebody is choking the damn thing! Do you think that muffling down puts strain on the engine? A friend of mine said that the new mufflers restrict the air flow and this puts strain on the engine and I don't want my hauled over engine to be under stress from day one If somebody could post pics of their stock mufflers with the signature RX100 sound I might be able to hacksaw my way to glory

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    Super Moderator sunilg's Avatar
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    Two-stroke query approved.
    (Been There Done That) x 3.25

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    Rusted aargee's Avatar
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    Sharing my 2 cents of knowledge
    Quote Originally Posted by dafc View Post
    The thing that has been bugging me is that my mechanic says once the engine has been hauled over I should run it on 2 times the amount of 2t oil I normally would for the first 1000 kilometers, does this make any sense?
    Yes to an extent & no if you don't wish to; if you need that authentic sound quickly, then the only way is to drip the oil like crazy ASAP all over from cylinder to exhaust. However during the run in period, a mere 25ml of oil per litre of petrol is good & 30 ml is preffered for 1st 1000 Kms. After than you may choose between 20ml to 25 ml. Also I hope you'll know to keep it rich during the run in period.

    Quote Originally Posted by dafc View Post
    Coming over to my second gripe somebody stole my rexy's silencer muffler (you know the mesh like thingy inside the silencer, Yes! somebody was crazy enough to steal it!) so I bought this new muffler and my motorcycle has lost the signature 'dib dib' it sounds muffled now more like somebody is choking the damn thing! Do you think that muffling down puts strain on the engine?
    No straing; its called core & not the muffler. The muffler is put up like baffles inside the exhaust which CANNOT be removed unless the exhaust pipe is cut open. So the core is the one you lost. But don't worry, over the time when there's sufficient carbon deposit you're bound to get back the sound. Ensure that your exhaust pipe is not stolen otherwise you'll NEVER get the same old Rx100's beat, especially with the new ones.

    Quote Originally Posted by dafc View Post
    A friend of mine said that the new mufflers restrict the air flow and this puts strain on the engine and I don't want my hauled over engine to be under stress from day one
    Not sure on the strain, but the newer ones have 1 additional baffle compared to the old ones. So they restrict the flow of exhaust gases due to which you'll have less sound. But I don't think it strains the engine in anyway.
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

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    First of all let me take the opportunity to thank you for reply to my post! I have a bunch of questions to ask you

    Quote Originally Posted by aargee View Post
    if you need that authentic sound quickly, then the only way is to drip the oil like crazy ASAP all over from cylinder to exhaust.
    Do you mean I should increase the ratio of 2t : petrol?

    Quote Originally Posted by aargee View Post
    After than you may choose between 20ml to 25 ml. Also I hope you'll know to keep it rich during the run in period.
    Don't you think 25ml per litre is a bit lean? I have one more thing to ask you if I run the engine with a lean mix does it make the engine susceptible to break down easily? Like you know the black marks the bore and piston get all over em once you push it beyond limits which mark a ceasure?
    RIP ਕਾਕਾ ਭੈਣੀਆਂਵਾਲਾ (Santokh Singh Rataurh)

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    Quote Originally Posted by aargee View Post
    Sharing my 2 cents of knowledge

    Yes to an extent & no if you don't wish to; if you need that authentic sound quickly, then the only way is to drip the oil like crazy ASAP all over from cylinder to exhaust. However during the run in period, a mere 25ml of oil per litre of petrol is good & 30 ml is preffered for 1st 1000 Kms. After than you may choose between 20ml to 25 ml. Also I hope you'll know to keep it rich during the run in period.
    Hey aargee, one question. The 2T oil is usually stored on the left hand side oil tank in the RX and it would provide some fixed amount of oil to the engine. How do I vary the flow. Do I add additional oil with petrol or I keep the oil tank completely empty and add 2T oil to petrol everytime I fill up? If I need to have oil in the side tank and add some additional oil in petrol, how do i know how much does the side tank supply and accordingly how much do I add?

    Sorry for a lot of questions. But just want to know how do people usually do it. Am also getting my RX restored with a new engine block and piston set. So I will need to do running in and hence need some info from you.
    | '91 Yamaha RX100 | '08 Suzuki Swift | '08 Honda Dio | '09 Bajaj Pulsar 220F |

    My RX100 Restoration project

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    Quote Originally Posted by Alibaba View Post
    If I need to have oil in the side tank and add some additional oil in petrol, how do i know how much does the side tank supply and accordingly how much do I add?
    If you are using Autolube pump (side oil tank) then there is no need to calculate anything. Just make sure the oil pump is set to specifications and use good quality 2T oil in the oil tank.

    During running in period, add perhaps 1% oil to petrol to be on the safer side.
    A lone amateur built the ark. A large group of professionals built the Titanic...

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    Quote Originally Posted by dafc View Post
    Do you mean I should increase the ratio of 2t : petrol?
    Its upto you. You may do it via oil pump or keep the oil pump in the regular ration, but have a premix for the additional amount

    Quote Originally Posted by dafc View Post
    Don't you think 25ml per litre is a bit lean?
    Lean??? What do you mean by lean? Are you saying 25ml is less or fuel will become lean?

    Quote Originally Posted by dafc View Post
    if I run the engine with a lean mix does it make the engine susceptible to break down easily?
    More prone to trouble. My question will be Why?

    Quote Originally Posted by dafc View Post
    Like you know the black marks the bore and piston get all over em once you push it beyond limits which mark a ceasure?
    I didn't understand this part

    Quote Originally Posted by Alibaba View Post
    The 2T oil is usually stored on the left hand side oil tank in the RX and it would provide some fixed amount of oil to the engine. How do I vary the flow.
    You need to open the right side cover where there's oil pump & adjust it. If you're experiened doing it, then no issues, otherwise refer manual or take it to Y.A.S.S.

    Quote Originally Posted by Alibaba View Post
    Do I add additional oil with petrol or I keep the oil tank completely empty and add 2T oil to petrol everytime I fill up?
    Choice is yours. Each has its own pros & cons.
    Pros of mixing will be that you're damn sure that you'll not run out of lubrication at any point & don't need oil pump anymore. Also your fuel tank is less susceptible to rust.

    Headache is you need to be carrying the 2T oil always unless you don't care about any damn 2T oil mix & you lose the convenience of topping up every month or so.

    Quote Originally Posted by Alibaba View Post
    If I need to have oil in the side tank and add some additional oil in petrol, how do i know how much does the side tank supply and accordingly how much do I add?
    Your regular pump is set to deliver xml of oil which your mech or Y.A.S.S should be able to tell. I guess the usual flow is half or 1 ounce per litre of petrol. If its 1 ounce then you don't need to mix

    Quote Originally Posted by Alibaba View Post
    But just want to know how do people usually do it. Am also getting my RX restored with a new engine block and piston set. So I will need to do running in and hence need some info from you.
    Anytime
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

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    Quote Originally Posted by aargee View Post
    Its upto you. You may do it via oil pump or keep the oil pump in the regular ration, but have a premix for the additional amount


    Lean??? What do you mean by lean? Are you saying 25ml is less or fuel will become lean?


    More prone to trouble. My question will be Why?


    I didn't understand this part


    You need to open the right side cover where there's oil pump & adjust it. If you're experiened doing it, then no issues, otherwise refer manual or take it to Y.A.S.S.


    Choice is yours. Each has its own pros & cons.
    Pros of mixing will be that you're damn sure that you'll not run out of lubrication at any point & don't need oil pump anymore. Also your fuel tank is less susceptible to rust.

    Headache is you need to be carrying the 2T oil always unless you don't care about any damn 2T oil mix & you lose the convenience of topping up every month or so.


    Your regular pump is set to deliver xml of oil which your mech or Y.A.S.S should be able to tell. I guess the usual flow is half or 1 ounce per litre of petrol. If its 1 ounce then you don't need to mix


    Anytime
    Thanks man!

    What 2T oil do you recommend?
    | '91 Yamaha RX100 | '08 Suzuki Swift | '08 Honda Dio | '09 Bajaj Pulsar 220F |

    My RX100 Restoration project

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    Check you local store & post the list of 2T oil you get in your locality. I'll help you select the best among the row. Reason being, I can suggest you any oil, but sadly 2T oils are becoming a thing of past these days.
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

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    Quote Originally Posted by aargee View Post
    Its upto you. You may do it via oil pump or keep the oil pump in the regular ration, but have a premix for the additional amount


    Lean??? What do you mean by lean? Are you saying 25ml is less or fuel will become lean?
    My apologies for using a term that I myself am not familiar with and causing confusion. My doubt about the ratio was cleared by the picture a couple of posts up. Which one of castrol jasofc grade, kinetic 2t no jasofc grade and mak 2t jasofc grade 2t oil would you recommend?
    RIP ਕਾਕਾ ਭੈਣੀਆਂਵਾਲਾ (Santokh Singh Rataurh)

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