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Author Topic: Larger displacement 1 or 2 cylinder Hondas  (Read 1692 times)

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Offline greenjeans

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Larger displacement 1 or 2 cylinder Hondas
« on: October 17, 2012, 09:05:03 AM »
Hey guys -

I'm looking for a motor for my street tracker project.   Has to be a Honda.    Do you guys know of any motor similar to the GB500T or the XR500 that maybe on a street version of a bike that I may be missing ?    Was there an SR500 ?      Want a twin, but not opposed to a thumper.

Don't really want a newer engine, unless it "looks" older.

Ideally, I'd like a 4-stroke as I'm not an exhaust guru.

Any ideas ?   Models that I'm missing ?


Found a FT500 locally - thumper.    Exhaust is 2 into 1.   Can anybody explain to me in layman's terms why they have 2 pipes coming out of the head on a single piston engine ?        Those are 4-stroke no ?
« Last Edit: October 17, 2012, 11:20:41 AM by greenjeans »
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Offline jas67

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Re: Larger displacement 2 cylinder Hondas
« Reply #1 on: October 17, 2012, 09:15:14 AM »
GB500, XR500, and SR500 (Yamaha) are all thumpers (singles).

AFIAK, if you're looking for a parallel twin, then the largest classic looking air-cooled one from Honda is the CB500T.   Anything larger from Honda is going to be a V-twin, four cylinder, or thumper (XT/XR 600 & 650).

You can get larger from Yamaha in the XS650 (TX750 -- don't remember if that was a twin or triple), or from Kawasaki, as they had a KZ750 that was a twin.

I dunno if Suzuki did any big parallel twins or not.

Avoid the Yamaha TX500 DOHC motor, it had a lot of design problems.
« Last Edit: October 17, 2012, 09:20:45 AM by jas67 »
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Online seanbarney41

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #2 on: October 17, 2012, 12:30:47 PM »
...Honda XBR500, very similar to the GB...they have one pipe for each exhaust valve...4 valves per cylinder
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Offline joesmotos

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #3 on: October 17, 2012, 06:25:09 PM »
THe early XR500's(1979 to 1982 i believe) were basically the same engine they put in the Ascot..they are 4 valve heads..they just had two exhaust ports so they put two small pipes into 1...the 1983 Xr's were that Radial valve head,basically the same as the GB500...course they put electric start and changed some other stuff)..i had a couple Ascots,i raced one for a long time....the starters did some weird stuff,not so much the actual starter itself but the bushing support in the side cover would wear and make the shaft for the throwout bearing kick sideways(im not sure what the term is for that part) but it wouldnt engage well and some folks had the bushing replaced with a needle bearing..

The SR500 Yamaha was a pretty well proven engine,basically the same as the TT500 i think..2 valve head,plenty of stuff still around for those..

The GB i dont know alot about except they went way up in price anda good one is hard to find..i rode one once it was pretty nice,i thik theyre sorta rare these days.

just my two cents worth
Joe
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Offline 754

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #4 on: October 17, 2012, 06:51:11 PM »
 If you like vintage look use xl 350, single head pipe, bore to at least 400, they used to make strokerkits for them too.
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Offline scottly

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #5 on: October 17, 2012, 07:37:51 PM »
XR500s also had 2-1 exhaust pipe. It's a 4 valve motor. The FT500 basically has a de-tuned XR motor, with electric starter instead of kick-start with compression release. I have an FT, and it's not a bad bike at all, either on-road, or off; certainly better that my old BSA 441 Victor was! ;)
EDIT: Sorry Joe, I didn't read your post before I replied. :-[
« Last Edit: October 17, 2012, 07:44:46 PM by scottly »
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Offline joesmotos

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #6 on: October 17, 2012, 08:24:13 PM »
Yeah those old Xl250 and 350 Honda engines were almost bulletproof,i had a 1972 XL250 with the Powroll stroker and a big ass piston,made it 391cc,put a nitrous kit on it and dragraced it..lol

Ran it on the roadrace track to with a different set up and did pretty good there also.
I loved that bike but man if you didnt kick it just right it would break your leg..
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Offline greenjeans

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #7 on: October 18, 2012, 02:49:37 PM »
Found an Ascot w/ parts bike locally.   It actually is pretty clean, has title and runs.    Asking price $1500

Seems a bit high, but, considering the scarcity of them, maybe not such a bad price ??
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Offline Old Scrambler

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #8 on: October 22, 2012, 03:16:39 PM »
I have a few FT500s.......Loved them :) :) :)

$1500 locally is low cost shipping and maybe its negotiable........$1800 and up will buy really clean examples most anywhere........the top end is $3500 (I sold) for just like new with 131 miles.
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Offline Terry in Australia

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #9 on: October 23, 2012, 12:09:43 AM »
Sorry I didn't get a chance to take some pics of the XR500 in my garage on the weekend mate, I put my back out on Sunday and I haven't been out of my chair since. If you still want them, I'll shoot some this weekend? Cheers, Terry. ;D
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Offline Xnavylfr

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #10 on: October 23, 2012, 10:13:02 AM »
I think Suzuki has a ONE lunger 650cc.


Xnavylfr(CHUCK)
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Offline Terry in Australia

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #11 on: October 23, 2012, 02:47:30 PM »
That's right Chuck, in fact the Suzuki DR range went from 250cc up to 650cc, from memory. Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline gerhed

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #12 on: October 24, 2012, 04:49:31 PM »
--'83 Honda XL600R--dual purpose bike
--I pulled the engine (600cc, 4 valve, dual carb--50 or so horses)
--stuck it in a CB360 frame
--flexes a little--be careful !!
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Offline LesterPiglet

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #13 on: October 24, 2012, 04:58:45 PM »
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Offline Terry in Australia

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Re: Larger displacement 1 or 2 cylinder Hondas
« Reply #14 on: October 25, 2012, 11:56:53 PM »
Quote from: gerhed on October 24, 2012, 04:49:31 PM
--'83 Honda XL600R--dual purpose bike
--I pulled the engine (600cc, 4 valve, dual carb--50 or so horses)
--stuck it in a CB360 frame
--flexes a little--be careful !!

Cool! ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)
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