Question about 1984 Honda VF 750 S

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83 vf750f - engine rebuild questions

Hey all! i have a vf750f that i picked up 4 very little. There is a slap sound on idle from the engine, and the diaphragms are all torn. I fixed them marginally and the bike ran like a rocket for 2 weeks till they tore again. The bike starts 1st time every morning - love hondas! anyway - i am thinking of replacing (in order of priority) diaphragms/ cam chains (+ tensioners??)/rings/valve seals. I know the old saying is - if you open the engine, replace everything. Is this worth it? maybe ill ge away by just slipping through new cam chains through the heads for now (the linked ones) - leave the rest as is? bike uses hardly any oil and compresison seems great - minimally i would then only need new top gasket (can u reuse it?) and the chains instead of the whole lot? dont scratch if it aint itchin, right? I look fwd to hearing the mixed responses - i am personally veering toward the minimal fix - and spend $$ on front wheels / rear shock rebuild / etc. I also want to remove the top cowel and have a naked look - meaning i would need different clocks. Perhaps newer honda firestorm or something?

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  • FstaRockr Burns May 20, 2009

    point taken - assuming the 'slapping' noise on idle is chains that have stretched - wont that affect power/sprocket wear? i could get a head gasket and slip through the linked types - i have a torque wrench for correct tightening. . . that way i dont open the engine @ all which is great.. is there a way to determine whether the noise is from the guides or the chain? i might do a cam surface inspection through the valve covers and see what that looks like - 


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From another Honda guy,If it ain't broke don't fix it.(If you paid for a total rebuild,They would only replace what is bad)

Posted on May 20, 2009

  • Randy Hough
    Randy Hough May 20, 2009

    I would pull the valve covers and check the valve clearance,Since this is the most common noise and lose of power you will ever get from a Honda,Also a stretch chain can wear the gears prematurely,but it does have an auto adjusting tensioner,so the chain would be way stretch out if your hearing it slap or the tensioner failed.You should be able to pull the cam gear cover and inspect the gear and chain tension.

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NOT REALY A SOLUTION BUT STAY AWAY FROM CLYMER MANUALS FULL OF INCORRECT PROCEDURES THAT WILL REALY MESS YOU UP

Posted on Jun 28, 2009

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Howdy, i just rebuilt my husky single cyl 450 from the ground up. blew the main bearing. it is true they will try to charge you through the roof!!! They wanted $3500 for the parts and labor... i sourced them the parts and gave them just the motor and saved just over $1000. i know you don't wish to go this far as your motor still runs and may only need minor work, and i recomend you dont get too carried away as hondas are bulletproof, but i heard mine run today for the first time since the rebuild and am very very impressed!!!
slap the cash on the new cam chain and tensioners, new carby manifolds, like rockitman187 said check your valve clearences. new plugs and new filters all round and you will be laughing your way around every corner

Posted on May 28, 2009

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