Author Topic: j.a.p ohc parts  (Read 45286 times)

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Offline k2000x

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j.a.p ohc parts
« on: January 11, 2010, 05:18:28 PM »
guys just got a ohc j.a.p 500 speedway motor for my hagon were can i buy parts

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #1 on: January 11, 2010, 05:55:02 PM »
hi
do you realy have an ohc jap motor they are very rear and hard to get parts for.if you have a 5stud or 4b 4 stud or 84s parts come up from time to time on ebay most get there parts from uk
cheers
jim

Offline Hoony

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Re: j.a.p ohc parts
« Reply #2 on: January 11, 2010, 06:58:52 PM »
i never knew they they made OHC, i thought they were all push rod engines, any chance of posting a pic?
Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #3 on: January 11, 2010, 07:24:05 PM »
hoony
the ohc is a double over head cam 4 valve hard to find and so are the pics of them if you whant 1 search 4v jap

firko

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Re: j.a.p ohc parts
« Reply #4 on: January 11, 2010, 07:36:49 PM »
The 4 valve JAP was a bit of a floperoo but is a tasty collector piece. I doubt I'd race one because of the parts problem. I know someone who'd probably be willing to swap a 2 or 4 valve Jawa for the JAP if you're interested K2000X

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #5 on: January 11, 2010, 07:55:29 PM »
firko
if it were mine 10 jawa motors would not see it move from my garage.
hoony
there is a guy who races in our club days who has a hagon 84s and also a 4v dohc jap i will get some pics for you if he brings it along.

Offline Hoony

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Re: j.a.p ohc parts
« Reply #6 on: January 11, 2010, 08:48:38 PM »
Thanks Jim.

I have a fondness for old speedway iron.

V twin 1000cc japs are a nice old unit as well.
Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #7 on: January 11, 2010, 08:54:05 PM »
when i used to road race (84s jap in a goldy frame) a guy call bob jolly (i think that was his name) from s.a had a vtwin jap in a manx frame.almost as good as eric deb vincent.
cheers
jim

Offline Hoony

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Re: j.a.p ohc parts
« Reply #8 on: January 11, 2010, 09:10:50 PM »
Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline KB171

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Re: j.a.p ohc parts
« Reply #9 on: January 11, 2010, 09:40:28 PM »

A nice old unit for ya Hoony 8)

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #10 on: January 11, 2010, 10:02:34 PM »
hoony
thats not a dohc 4v jap it still has push rods.the motor has a huge cam chain cover in polished alloy very pretty
cheers
jim

Offline k2000x

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Re: j.a.p ohc parts
« Reply #11 on: January 12, 2010, 07:27:30 AM »
yeah its a o.h.c jap she's ruff as guts but all there it had been sitting under a saw bench for a bloody long time. he had it in a some type of sprint car/ go kart thing with a norton box...i will have a look at some sites in england first. i havent pulled it apart  yet 2 see what condition the inside is like

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #12 on: January 12, 2010, 08:01:11 AM »
kx2000x
sent you a email with pics of 4v jap also to you hoony.
is this the 1 you have

firko

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Re: j.a.p ohc parts
« Reply #13 on: January 12, 2010, 10:02:39 AM »
They were still crap Jim. I'd rather have those 10 Jawas, at least you'd be 1: able to get parts and 2: be confident of finishing a meeting.
The reason they're rare is that most of them ended up as boat anchors or like John Titman used his for, as a door stop. We've got a mate who thought he was going to clean up big time selling his and asked serious money for it in the speedway magazines in the UK.  He got no response whatsoever other than blokes calling him a thief for asking so much. Jonesy's got one of the best speedway engine collections in the world and he didn't even bother with our other mates 4v JAP. Having said that, he doesn't have one in the collection and he's hot to trot on a swap when K2000X finds that the parts situation makes the engine financially unviable. I know I'd rather have a Jawa that is not only faster, lighter and way more reliable but you can buy parts in K Mart (well...not really but you know what I mean). JAP dohc4v engines were too little, too late when compared to the Weslake and even the not so good 894 twin cam Jawa.

Offline jimg1au

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Re: j.a.p ohc parts
« Reply #14 on: January 12, 2010, 12:21:58 PM »
mark
i wasnt going to use it just polish all the alloy and there is a lot and sit and look at it.japs are too fragile and expencive to rebuild,they just look nice.with the pre 85 slider class now any upright will do 4v or 2v,if i could afford 1 i would have either a godden or gm my be the last 4v jawa long stroke upright with rec,oil pump and pvl ign as std
cheers
jim