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Post by jonisingt35r on Jul 30, 2016 12:25:07 GMT
Hello Asking for some help with a engine rebuild, got a hole in my piston heads ok but not sure how to select the right piston the barrel has slight scoring in it I'm tempted just to bung in a new piston and to for it
Also do I install nw crank bearings as metal shavings from piston must have got inside and contaminated it, while I have ether engine out is there anything else I should be doing ?
had a look on eBay on pistons really not sure on their quality where is best place to buy ?
Thanks
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Post by djloone on Jul 30, 2016 12:56:11 GMT
The barrel a standard cast 200?...im led to believe (1 of the crew here will know for sure)that they can take a fair share of abuse..so if it looks fine id def consider it usable
LOON-E
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Post by henri on Jul 30, 2016 15:06:35 GMT
pistons ,check out "grand sport.de " , best pistons around , an if ya can catch a fingernail in any scores on barrel it needs a re-bore . H
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Post by jonisingt35r on Jul 30, 2016 16:39:12 GMT
Think I will get it re ground wondering if anybody knows where I could get it done? Or is it just cost effective must to get a new one? Really not sure of the quality of the ones made in India seen a few on eBay sure they all come from there many? Or could somebody recommend new barrel and piston and where to got one
Many thanks.
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Post by henri on Jul 30, 2016 19:45:00 GMT
any local motor engineer can re-bore ya barrel ,30-40 quid , an grand sport.de do the oversize pistons n rings , best quality n cheaper than piaggio or italians . are there any marks on piston crown , as in a "1" ,"2" ,or a .1 or .2 .denoting its a oversize already , if they might of been destroyed ,take piston n barrel to engineer shop who can re-bore an get em to measure them .order nxt size piston an take new piston so shop can hone barrel to correct clearance . H
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Post by jonisingt35r on Jul 30, 2016 20:54:50 GMT
I'll have a look for these marks I've had a good look at the marks inside the barrel Must say they do look very small I've seen on ebay a honing tool for 12 quid Wondering if it's worth a go The marks are very very small
One thing that is puzzilising me is what piston size am I looking for ? I measured the barrel and it's 66.99mm
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Post by pxguru on Jul 31, 2016 6:17:46 GMT
66.9 is second oversize. Seems like it's had a few reasons bores already.
Are you looking to make it faster? Or just go OK? Personally I would never buy an original 200 piston. Any of the other options are better and faster.
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Post by henri on Jul 31, 2016 7:08:12 GMT
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Post by jonisingt35r on Jul 31, 2016 7:34:10 GMT
Thanks for the piston info, can I make not go faster is there a bigger barrel and piston available? Thanks
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Post by jonisingt35r on Jul 31, 2016 7:34:34 GMT
Thanks for the piston info, can I make not go faster is there a bigger barrel and piston available? Thanks
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Post by jonisingt35r on Jul 31, 2016 7:43:20 GMT
Also I've split the block there was a hole is piston so metal has got.into the crank can somebody recommend a set of bearing pullers that would remove all the bearings in the crank case really unsure how to tackle this. Thank you
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Post by henri on Jul 31, 2016 10:39:43 GMT
heat cases n drive bearings out with large sockets as drifts .support rear of case on blocks of wood as you do this .an in answer to first question theres lots of bigger barrels/kits to choose from , mallosi/polini/pinasco/parma/falc/quattrini .but they aint cheap an need better exhausts n carbs to work right ,an better clutches to not fail. tunings expensive,skilled an always at a cost to reliability an mpg an ya wallet .H
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Post by jonisingt35r on Jul 31, 2016 14:53:03 GMT
Thanks very much for the help got all bearings out everything stripped down and clean think I'm going to go for a bogs standard piston
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Post by pxguru on Jul 31, 2016 15:36:14 GMT
What makes you want a standard piston? They have rings that dont seal properly and over stress the crank when driven hard.
Are you thinking because you are new to this, we don't know what we are talking about too? You are going to a lot of effort, might as well do a proper job.
Barrel kits are a whole different thing that might be too much for now. But there are a few different standard pistons and all are better than the Piaggio ones.
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Post by jonisingt35r on Jul 31, 2016 17:50:55 GMT
⁹What's a proper job then new barrel and piston?
I'd rather pay 50 for a new piston 350 for a barrel and piston is a lot but is rather have something that's not going to go bang again
Just want something that's reliable real don't want to strip everything down again and renew those seals
Are those grand sport pistons reliable?
is there such thing as a value barrel and piston?
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Post by doulsy on Jul 31, 2016 18:25:51 GMT
⁹What's a proper job then new barrel and piston? I'd rather pay 50 for a new piston 350 for a barrel and piston is a lot but is rather have something that's not going to go bang again Just want something that's reliable real don't want to strip everything down again and renew those seals Are those grand sport pistons reliable? is there such thing as a value barrel and piston? beedspeed do a cheapish barrel, i just gave an oversized barrel away the other day, sods law
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Post by pxguru on Jul 31, 2016 19:16:43 GMT
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Post by jonisingt35r on Jul 31, 2016 19:28:31 GMT
thanks very much for taking the time really appreciate it
I do have the cash for any barrel but at the moment id rather get it going and enjoy it, think ill go form that beed speed one,
Thanks very much.
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Post by shaunbond on Aug 1, 2016 13:15:36 GMT
An option worth bearing in mind would be a Harry Barlow stage 4 barrel, piston and head. He can rework yours, including a rebore. Mines at 66.9mm! Or I think exchange or outright buy. Cheapish solution and you get a torquey motor with minimal impact, if any, on economy and longevity. Been riding mine for around 3-4 years and other than a Carb gasket failure causing heat seize (not a problem of the set up) its been great. After the seize all I did was clean up the barrel and piston with wet and dry and put some new rings in. As someone said they just go and go. If i post the pics many would say it was scrap!
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Post by shaunbond on Aug 1, 2016 13:23:23 GMT
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Post by henri on Aug 1, 2016 14:25:37 GMT
not scrap to me , when skint in past ive polished up much worse an re-used . jonising , the beedys one will be indian ,there of variable quality , i'd def advise the grand-sport.de one over beedys . there the best quality around an not much more pennys , H
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Post by jonisingt35r on Aug 1, 2016 20:16:13 GMT
Yes was thinking it did cross my Ming it might be Indian, thanks for the heads up,
Are beadspeeds reborn's any good? Really havnt got anybody to do a rebore
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Post by henri on Aug 1, 2016 20:38:35 GMT
beedys dont do re-bores , there just a spares shop , but they do have a trusted engineering shop they use . H
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Post by pxguru on Aug 1, 2016 21:11:53 GMT
I have had a few of those 68mm Beedspeed pistons before. They are Indian but work fine and last as long as any other. For a reasonably standard set up it's not that remarkable.
There will be somewhere local to you that does re-bores but for doing it all yourself won't be any cheaper than the Beedspeed Iron barrel.
Don't get confused with the Beedspeed Indian Alloy barrel kits....they are, sh**e.
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Post by jonisingt35r on Aug 2, 2016 20:24:32 GMT
My barrel measures 69.9mm does this mean it's toast as the biggest piston I can see is 69.1mm not sure how it works :
Maby there is an equation or allowance for the ring Maby? Not sure
Thanks
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Post by pxguru on Aug 3, 2016 6:31:47 GMT
I think you have confused yourself? Before you said it was 66.9.
I measured the barrel and it's 66.99mm
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Post by jonisingt35r on Aug 3, 2016 17:58:41 GMT
Yes I think i have have will measure it later lots of information lots to take in.
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Post by jonisingt35r on Aug 6, 2016 8:16:21 GMT
66.9 That's he size of my bore wonder if somebody could tell me how to select a piston for that hole size please
Thanks
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