Thumper Club Forum
Technical => Bike Problems/Questions => Topic started by: genawin on September 10, 2009, 03:00:03 PM
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Hello , I'm looking for available alternatives can anybody advise maybe - xt350 1.5mm o/s (87.5mm) or xt550 (92mm) has anybody got any suggestions ?
thanks Martin.
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HI, why r u after an over sized piston??? has yours seized??? or do you want more power???
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It has started to burn oil recently - i stripped it to find that it has old corrosion marks in the bore showing that it has stood for some time, i'm not looking for more power in fact i would prefer to keep it standard.
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you could try having the bore honed and fitting new rings, valve stem seals etc
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Yes that's good advise i had it honed on Wednesday but the marks are still there so i have put it back together whilst the sun is still shinning ! and i source parts.
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Well......if you dont mind waiting a couple of months i may have a really sweet srx 400 engine up for sale as im gonna fit a 600 motor???burns no oil....returns 95mpg!!!!! with only 21,000km 12,000 mile?
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just as an aside.....i sometimes run a stock 400 engine in my '6' chassis, only mod is a single 40mm dellorto on a handmade manifold....and to be honest it is a sweet motor....i think it revs better than the 600....not so much poke going up the gears, but top speed isn't far off, just takes a bit longer to get there.
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like the idea of only one carb, any info on the manifold construction?
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XT350 has 19mm piston-pin, XT550 has 20mm!
Sizes of the pistons I can give you as I`ve got the two pistons at home (and some more) for my own big-bore project!
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like the idea of only one carb, any info on the manifold construction?
Have just posted an advert in 'For Sale' for a single carb. XT/SRX manifold.
Boyd
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XT350 has 19mm piston-pin, XT550 has 20mm!
Sizes of the pistons I can give you as I`ve got the two pistons at home (and some more) for my own big-bore project!
Hello Jester, have you got a piston between 87 and 92mm, i have just bought a xt550 piston from the U.S. (unfortunately damaged) and it has a 22mm gudgeon pin ?
could anyone confirm the srx400 pin size ?
thanks Martin.
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....have you got a piston between 87 and 92mm.....
certainly I have! Will check at home and let you know!
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....have you got a piston between 87 and 92mm.....
certainly I have! Will check at home and let you know!
I have pulled it apart again and noticed how thin the liner is plus a second look at the bore has pushed me in the direction of new set of rings and keep my fingers crossed as the marks in the bore are minor , i might have a 2nd hone . so if you have some srx400 , xt/sr 500 std or 1st o/s rings please let me know.
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Have you considered Triumph (new) Bonneville pistons, theyre 90mm with a 20mm gudgeon pin. I haven't checked the crown height yet. I bought a pair while I was considering overboring a GN400 and the whole lot is still in a box under the bench.
Jez
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Photo included of Standard SRX-4 piston/barrel
Ian
(http://i193.photobucket.com/albums/z24/ian650/P1020747.jpg)
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SRX pin -size: nobody got an idea?
I`ve got several pistons suitable (what diameter is concerned)...but pin-size is VITAL!!
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SRX pin -size: nobody got an idea?
I`ve got several pistons suitable (what diameter is concerned)...but pin-size is VITAL!!
Hello Jester , i posted that i have pulled it apart again and decided to try a 2nd hone with new rings.
thanks for your help.
Martin.
p.s.the pin is 20mm.