yamaha rd250 need advice
yamaha2strokes
over with the plugs in the plug caps there is no spark, i'm thinking its
something to do with the wiring, which wires in the headligh are the ones
for the coil, the electronic ignition system seems to be ok but i'm not
really sure what it is.Thanks.
Austin Shackles
<va...@brown26626.fsnet.co.uk> enlightened us thusly:
>Hi, i have just got a yamaha rd250 1979, the ignition works but when kicked
>over with the plugs in the plug caps there is no spark,
so the ignition *doesn't* work, then...
can you get a spark from the leads to the casing? If so, caps or plugs are
iffy.
--
Austin Shackles. www.ddol-las.net my opinions are just that
In Touch: Get in touch with yourself by touching yourself.
If somebody is watching, stop touching yourself.
from the Little Book of Complete B***ocks by Alistair Beaton.
Dr Ivan D. Reid
wrote in <urcod2t1qqugt7e8c...@4ax.com>:
> On or around Thu, 10 Aug 2006 19:13:41 -0400, "yamaha2strokes"
><va...@brown26626.fsnet.co.uk> enlightened us thusly:
>>Hi, i have just got a yamaha rd250 1979, the ignition works but when kicked
>>over with the plugs in the plug caps there is no spark,
> so the ignition *doesn't* work, then...
Either that or he's not grounding the plugs to the engine/frame.
> can you get a spark from the leads to the casing? If so, caps or plugs are
> iffy.
--
Ivan Reid, Electronic & Computer Engineering, ___ CMS Collaboration,
Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN
GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005
WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon)
KotPT -- "for stupidity above and beyond the call of duty".
yamaha2strokes
so needs clearing out but other than that sounds sweet, it was the plugs,
tried some from another bike but no spark and i didn't think to try
others.Thanks for the info. Also does anyone know if 350 carbs will
work(make it run) because the person i bought it off said his m8 had done
130mph with 350cc carbs on the rd250.
Steve Parry
From what I recall the carbs are the same units, it's just the jetting
throughout that's different.... and if jetting alone coul've made the 350
pull 130 doncha think Yamaha would have done this?
BTW is your's a 6 speed gearbox? I'm not sure when it changed but the first
[1] 250's had a blanking plate so you could only engage 5 gears. A simple
cheap fix was to swap an inexpensive part to get the 6th gear.
[1] probably earlier than this though
--
Steve Parry
K100RS SE & F650
and a 520i SE Touring for comfort
yamaha2strokes
know what speed it would do with stadard 250 carbs and with 350.Thanks.
Hambo 1.
the cops behind it (joke)
then I had mine bored out to 371cc (rebuilt) and carbs bored out, rejetted,
JR expansion pipes and it only did 120-125 flat out in the red.
Mike.
Southern Ireland
"yamaha2strokes" <va...@brown26626.fsnet.co.uk> wrote in message
news:1e0159437b3be726...@localhost.talkaboutmotorcycles.com...
yamaha2strokes
bikes. Well i dunno if mines got 250 carbs or 350 but anyway it runs so
i'm not sure.Thanks for the info everybody.
Ace
About 95 with standard cardbs, 90 with some badly set-up 350 ones.
'Cos they _will_ be badly set-up. Even if they were re-jetted to run
properly, I don't think they'd make it go any faster. The normal mod
was just to drop a pair of 400 barrels and carbs on - and not tell the
insurance, of course, and continue to ride it on L plates.
Hang on, you're talking about the 350? Then presumably you're
referring to the LC models (RD on its own usually means the air-cooled
250/400), which would, IIRC, crack the ton.
--
_______
.'_/_|_\_'. Ace (brucedotrogers a.t rochedotcom)
\`\ | /`/ GSX-R1000K3
`\\ | //' BOTAFOT#3, SbS#2, UKRMMA#13, DFV#8, SKA#2, IBB#10
`\|/`
`
Lozzo
> On Sat, 12 Aug 2006 16:06:05 -0400, "yamaha2strokes"
> <va...@brown26626.fsnet.co.uk> wrote:
>
> >Yes my rd250 has a six speed gearbox and i think that all six engage.Do you
> >know what speed it would do with stadard 250 carbs and with 350.Thanks.
>
> About 95 with standard cardbs, 90 with some badly set-up 350 ones.
> 'Cos they _will_ be badly set-up. Even if they were re-jetted to run
> properly, I don't think they'd make it go any faster. The normal mod
> was just to drop a pair of 400 barrels and carbs on - and not tell the
> insurance, of course, and continue to ride it on L plates.
400 barrels don't just 'drop on' to a 250 bottom end, they are
completely different. 350 barrels fit with the correct pistons and
heads.
> Hang on, you're talking about the 350? Then presumably you're
> referring to the LC models (RD on its own usually means the air-cooled
> 250/400), which would, IIRC, crack the ton.
350LC carbs are 26mm, RD250 and RD400 air-cooled carbs are 28mm. There's
no advantage to fitting LC carbs to an air-cooled bike. Just buy the
correct needles and jets for the carbs your bike should have, they
aren't expensive.
--
Lozzo
GSX-R1000 K1
GSF600SW
"Loz has a god, and this god of his has 16 valves" (tm) Pip, May '06
Ace
>Ace says...
>> On Sat, 12 Aug 2006 16:06:05 -0400, "yamaha2strokes"
>> <va...@brown26626.fsnet.co.uk> wrote:
>>
>> >Yes my rd250 has a six speed gearbox and i think that all six engage.Do you
>> >know what speed it would do with stadard 250 carbs and with 350.Thanks.
>>
>> About 95 with standard cardbs, 90 with some badly set-up 350 ones.
>> 'Cos they _will_ be badly set-up. Even if they were re-jetted to run
>> properly, I don't think they'd make it go any faster. The normal mod
>> was just to drop a pair of 400 barrels and carbs on - and not tell the
>> insurance, of course, and continue to ride it on L plates.
>
>400 barrels don't just 'drop on' to a 250 bottom end, they are
>completely different. 350 barrels fit with the correct pistons and
>heads.
I just knew you'd be along soon to correct me ;-)
>> Hang on, you're talking about the 350? Then presumably you're
>> referring to the LC models (RD on its own usually means the air-cooled
>> 250/400), which would, IIRC, crack the ton.
>
>350LC carbs are 26mm, RD250 and RD400 air-cooled carbs are 28mm. There's
>no advantage to fitting LC carbs to an air-cooled bike. Just buy the
>correct needles and jets for the carbs your bike should have, they
>aren't expensive.
But if you read the OPs stuff, it soon becomes clear that he comes
from the 'remove your baffles' school of go-fast modifications.