Author Topic: project mkII rs200  (Read 5962 times)

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Offline hmmmnz

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Re: project mkII rs200
« Reply #40 on: January 27, 2017, 01:43:28 PM »
well i found out why my stock units were pissing fuel...
one of the floats doesnt float :D it must have a pin hole i cant see, but given a shake you can hear the fuel sloshing around inside it.

starts well, but a bit too well for a test ride. ill keep you updated.
if nothing else the new carbs are worth it for the floats and random jets
mini buffalo (chibi copy) 68' mkII 200

Offline BRT-GTR

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Re: project mkII rs200
« Reply #41 on: January 28, 2017, 06:14:46 AM »
      Pop that float in a pan of hot water, you should soon see where the pin hole is.
Growing old is compulsory, Growing up is optional.

Offline skiri251

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Re: project mkII rs200
« Reply #42 on: January 28, 2017, 02:21:49 PM »
well i found out why my stock units were pissing fuel...
one of the floats doesnt float :D it must have a pin hole i cant see, but given a shake you can hear the fuel sloshing around inside it.

starts well, but a bit too well for a test ride. ill keep you updated.
if nothing else the new carbs are worth it for the floats and random jets

My stok carbs got okay floats. No sloshing sound.
They leaked gas from float bowl gaskets. I had to put two of them per carb to stop the leak.
I put brand-new stock parts. Main jets, pilot jets, float valve assy. and yet no power and bad gas mileage.

Offline hmmmnz

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Re: project mkII rs200
« Reply #43 on: January 31, 2017, 06:08:01 PM »



i decided id change back to the original carbs for a test.
the new carbs had a piss poor bottom end, but a really good top end,

so i chuck on the carbs, starts first kick as always,
take off and the bottom end feels great, but i get to the top end and it feels pretty crap, couldnt get above 55mph

and way coming back up the hill to my place and a cylinder drops out and starts running on one,

i thought it was the condesor arcing out on the cover (its happened before)  but it felt considerably free'r revving,

parked it up and let it cool down before looking at it.

first thing i did was pull the plug,  it had crap built up on it.....  oh... nooo.....

put my finger on the plug hole and pushed down the kick start.....
noooooooo!!!!!   compression = 0 :(

pulled off the head to be greated with this tale of woe

luckily in my arsenal of spares i had one piston that was in good shape, with 1 good ring,
exactly what was needed


so swapped it all over and happy days


most importantly my stupidly expensive ceramic coated barrels were still in perfect nick, not even a hint of a scratch (thank Hesus)

heres a couple more pics of the semi destruction





so one can assume that the main jet on the left cylinder is blocked,  and it was just running on the pilot jet the whole time,  much leanness = very hot
very hot = burny hole to piston
burny hole to piston = sadness

so therefore much leanness = sadness,
better to be a bit fat :D
mini buffalo (chibi copy) 68' mkII 200

Offline bsracer

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Re: project mkII rs200
« Reply #44 on: February 01, 2017, 03:18:58 AM »
Or the timing is off. I chased a problem of "hole'n" pistons for about two years. 9 pistons later I finally found the ignition failed internally (bearing apple cored the shaft) where I could not see it. I would think a lack of lubrication would lead to a seizure of the piston to cylinder wall.

paul
« Last Edit: February 01, 2017, 03:30:52 AM by bsracer »

Offline OldSwartout

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Re: project mkII rs200
« Reply #45 on: February 01, 2017, 10:20:27 AM »
I've got several of those, too. Mine were due to lean mixture at part throttle. They don't run well with a hole in the top of the piston. 

At least yours didn't put a lot of material through the piston into the crankcase, hmmmnz, although since it's aluminum it doesn't really do any significant damage in the bottom end.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline hmmmnz

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Re: project mkII rs200
« Reply #46 on: February 01, 2017, 05:01:42 PM »
Or the timing is off. I chased a problem of "hole'n" pistons for about two years. 9 pistons later I finally found the ignition failed internally (bearing apple cored the shaft) where I could not see it. I would think a lack of lubrication would lead to a seizure of the piston to cylinder wall.

paul

how do you mean the ignition failed internally? 
9 pistons thats alot, id be pretty pissed :D
im pretty confident that the timing is good,  and the fact the top end was good with the vm18-144's
then quite shit with the vm17-18 gives me faith that my carb is blocked some where,  might order a couple of spare pistons to be safe :D

its a bit frustrating having never ridden a bridgestone before this that i dont know what i should be expecting.
but hey ho, you dont make omlets with out breaking eggs :D

apparently i have another set of carbs somewhere as well (according to ebay i bought another set a year ago,  which i dont remember either buying or receiving)  ill have to have a look in my carb cupboard (yep i have a whole cupboard dedicated to carbs and carb bits :D )
mini buffalo (chibi copy) 68' mkII 200

Offline skiri251

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Re: project mkII rs200
« Reply #47 on: February 02, 2017, 09:48:25 AM »
Wow... my condolences.
When I bought mine, it came with a holed piston. That was a good side. The bad side had siezed piston. LOL.
Yeah, this is my first BS also so I don't know my bottom end is normal or poor.
But I have to say it is much better than with tired VM17-18s.

Offline vinny g

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Re: project mkII rs200
« Reply #48 on: February 02, 2017, 05:21:15 PM »
The blowing head gasket certainly wouldn't of helped.If if can blow out..it can suck in.

Offline bsracer

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Re: project mkII rs200
« Reply #49 on: February 03, 2017, 02:19:51 AM »
Or the timing is off. I chased a problem of "hole'n" pistons for about two years. 9 pistons later I finally found the ignition failed internally (bearing apple cored the shaft) where I could not see it. I would think a lack of lubrication would lead to a seizure of the piston to cylinder wall.

paul

how do you mean the ignition failed internally? 
9 pistons thats alot, id be pretty pissed :D
im pretty confident that the timing is good,  and the fact the top end was good with the vm18-144's
then quite shit with the vm17-18 gives me faith that my carb is blocked some where,  might order a couple of spare pistons to be safe :D

its a bit frustrating having never ridden a bridgestone before this that i dont know what i should be expecting.
but hey ho, you dont make omlets with out breaking eggs :D

apparently i have another set of carbs somewhere as well (according to ebay i bought another set a year ago,  which i dont remember either buying or receiving)  ill have to have a look in my carb cupboard (yep i have a whole cupboard dedicated to carbs and carb bits :D )

I guess I should have stated that it is a race bike and the ignition is custom. I had an ARD ignition from a racing BSA/Triumph modified to fit an SR175 Bridgestone. Had a new shaft made to fit the BSA cam taper to the BS transmission gear. I think maybe the shaft was just made of mild steel and after a bunch of races the bearing wore out the shaft. The ignition was shorting out internally when the generating magnet started bouncing around knocking off the protective coating causing it to contact and fry a hole in the piston. This happened like snapping your fingers but a bit faster.

paul

p.s. and I was pissed only because I picked up about 7 of the pistons (wiseco) for pretty cheap off ebay and thought I'd have them for a long time!
« Last Edit: February 03, 2017, 02:22:52 AM by bsracer »

Offline hmmmnz

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Re: project mkII rs200
« Reply #50 on: Yesterday at 08:24:15 AM »
Well, I replaced the main jets on both carbs.
And gave them a blow through in case more shit had managed
To get stuck in the passages.
No one likes a blocked back passage.

Everything was clear so I gave it a kick over
www.youtube.com/watch?v=eEF9mOcUoM0&

I love how this thing starts first kick.

Can't/won't take it for a test ride, as it's currently snowing here in Scotland.
Tell ya it was a manic ride to work on the bandit this morning.
More side ways action than I prefer on 2 wheels. One of these days I'll buy a car/ute for the winter.
Not today though Wink
« Last Edit: Yesterday at 09:35:40 AM by hmmmnz »
mini buffalo (chibi copy) 68' mkII 200

 


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