Question about 2002 Honda CRF 450 R

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It just began smoking a bit,hope new std. top end can apply.

Looks as though the carbs float seat took a dump and flooded into the motor oil from what i smell.As soon as i saw the puff of white blue out the pipe i took it out of service @ 80 and a hair hours showing.I tore it down for inspection and found the cylinder is true top to bottom within .0008'' and clean,and the valve guides pass also. , With new std piston specs to what the bore is at, a snug .002'' is what i have.So first: what are the recomended service specs for piston to cylinder wall? Second:What does Honda grant for the top, second, and oil ring end gaps (if at standard bore)?

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  • Wall Billeaud
    Wall Billeaud Jul 25, 2009

    Please excuse me,I was requesting tolerances,not put it back together with a scuffed p. skirt and obvious ring wear,you seem such an intellegent fella,so forgive me if you would dear sir .I is jus so we todd did,with my top certification on very many makes and all the models under each,for a bit over 35 years. Just looking for the specs from good 'ole Honda on this model.So hey, when you get stumped,get with me and i'll be glad to inform & get you goin by diagnosing the root of a problem with all the needed facts and info to help keep down alot of your uneeded trial and error waste of time :)!sorry you do not know these specs either.

  • Wall Billeaud
    Wall Billeaud Jul 26, 2009

    I Was Totally Wrong for that ,I Must Admitt. And Yes I do happen to have a Zone litterally rite next door to my home ,and i sure did'nt know they had anything but vehicle info,thank you a bunch, kind sir,i'll walk over and see.Peace to you and yours,wallace.

  • Wall Billeaud
    Wall Billeaud Jul 26, 2009

    how did you figure miles for amt. of hours?I thought that was really neat,whats the formula?

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  • Honda Master
  • 3,433 Answers

You opened the engine for a ouff of smoke at roughly 48,000 miles? A bit premature for a honda. Yes, ring end gap is necessary. Put it back together and change your oil. Finding out where the gas came from should be your concern. Sorry.

Posted on Jul 25, 2009

  • Ned C Cook
    Ned C Cook Jul 25, 2009

    did'nt mean to upset or insult you. I searched references I have on hand but ,nothing on the 450. Where are you located? If you have a autozone around you, They carry Clymer repair manuals for cars and bikes. The specifications tables are very comprehensive. . zGood luck.

  • Ned C Cook
    Ned C Cook Jul 26, 2009

    No problem wallace, The formula isthe average now of 60 mph x the number of hours. You said 80 hrs so, 80x60 is approximate mileage equivalancy.I wasn't aware of the scoring and skirt issues or it would have been a stand down for me, because if I can't see it, It would be wrong to advise ignoring. I hope you found the references you needed. Depending on the wear and severity of the scoring, You may end up buying a new cylinder kit. You know how to mic out all the tolerances, so I wish you luck. All is good, just a misunderstanding.

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Flooding


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B) So far, I don't know of any desktop computers that use an internal combustion engine, and use a fossil fuel to run it.
Hope not because this is going against the grand scheme of things, lol!

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