An obvious title Here's some background info - Got round to making a 10mm adaptor for the compression tester, made from a spark plug some old steel rod and a nut, after numerous ebay sellers screwed me around - Compression was: CYL = 1 2 3 4 DRY = 95 90 95 95 WET = 135 155 130 140 So yeah, looks like the rings are pretty knackered, and potentially even the valves seeing as though they are all hovering around 140psi wet which is apparently the lower limit according to the manual. Here's a pic of the plugs, the one on the right (cyl 4) is only one day old and has about 50km on it - So yeah this engine is pretty trashed it would seem. I would LOVE to do a rebuild on it as it's something I'd have an extreme interest in, but financially and technically, i dunno if its even possible. Whats involved in rectifying low compression? Pretty sure you can't buy oversized rings so would replacing them with new stockers and honing the bore out even solve any of this? My main worry with finding another engine is that it will be just as clapped out as this one i currently have. I imagine the wreckers will charge me $800+ for one and won't let me compression test it either. (happy to be corrected on this no ) The other more likely solution is I'll just continue to use it as is, because it runs just fine aside from being devoid of anything resembling power lol! Anyway if someone could lend me their knowledge cap that would be mostly appreciated ;D
my 2 cents, talk to a mechanic and get their take on it, could be as simple as a shim issue, failing that the motor is shagged, why not keep an eye out for a GSF250 Bandit red top engine, now that would be fun a GSX250F with variable valve timing. :Thumbs_up: I havnt heard of anyone selling piston and ring kits, As the bike was sold in Oz, might pay to talk to your dealer and see what they can source. How many KM's has your bike done ?
Yeah unfortunately i am the mech on this one haha, that's student induced poverty for you I did the clearances not 2000km ago and its running much better than before it, so i'm pretty sure its just done. Red top could be good ;D if i ever find one! (or i'll just do the 400 a bit quicker than planned heh) I reckon suzi parts would have the rings in the very least and i could get the block honed. But yeah i'd have to hunt someone down that could give me an experienced take on things it would seem! Cheers mate
Hey Desmo Let me say this, LOVE YOUR WORK!!! Everyone will have a different take on this issue, nothing with motors is ever clear cut. You could make the decision to re:build but really you can't make that call or even guess what your outlay may be until you dismantle. Then you have to be prepaired for the [UNKNOWNS] that can crop up. The deeper you go, the longer your pockets have to be. I tend to agree with Kiffsta, talk it over with your mechanic. Any mechanic will tell you pretty much what I have outlined above, can't really tell till we pull it apart? Plan B intails a huge leap in faith, you purchase another engine for your bike. Have you bought someones pride and joy or a pile of junk? You call this " Devils advocate ". Wish there was an easy answer to all this, but alas there isn't. :BangHead: Keep us posted as to your decision. Cheers Phil
Hey Desmo I reread your first post and the wet test results as you say lean towards worn rings and valves, when you did the compression test, did you have the throttle open fully ? I found this on another website If one cylinder has low compression you can do a wet test to help determine the cause of the problem. A wet test involves putting 1-2 tablespoons of oil. The extra oil in the cylinder will help seal up the rings, but do not tend to affect the valves or valve seats. If the compression fixed itself or improved by more than 30 psi, the rings are probably the problem. If it didn't affect the overall value then the problem is probably related to the valves If two adjacent cylinders have lower than normal compression and injecting oil into the cylinders does not increase the compression, the cause may be the head gasket leaking between the cylinders or cracked cylinders. A leak down test may also be performed to help isolate the problem. There are 2 Across's that have been in accidents for sale in Dubdo, might be a source of a cheap engine, as to how good they are... HHmmmm http://www.ebay.com.au/itm/Suzuki-Across-GSX250F-rolling-chassis-enginge-gearbox-etc-cracked-frame-/150772980597?pt=AU_Motorcycles&hash=item231ac51b75 http://www.ebay.com.au/itm/Suzuki-Across-GSX250F-Engine-gearbox-fairings-chain-and-sprockets-etc-/150772977812?pt=AU_Motorcycles&hash=item231ac51094
Spot on you can't be sure how bad a engine is until you pull it apart and clean it up. Of cause this is very cheep to do. it's putting it back together that costs. The problem is once it is apart the bike wont go until you rebuild or get a replacement.
Jeez so long since I've been on this forum : really should check em more often lol! Well finally got some time up my sleeve to get things checked. And with the bike slowly getting worse (have to slip the clutch like an rs125 off the lights when she heats up all the way, urgh!) Something needs to be done. Priced up the rings - $250 for a full set. Honing the bore wouldn't be too expensive as would the gaskets to do it. BUT there is also the issue of the rest of the engine being tired. For example the gearbox is really nasty and i know the ends of the cam lobes are chipped. So very much could be an exercise in futility as you've said. So bearing that in mind i did some shopping and found an across engine for $550, which i can juuuust afford. HOWEVER what's the go with buying an engine from a wreckers. Never done something like that before! Can you request that they check the compression or something like that. The prospect of buying it for $550 to find its just as flogged out as what i have now is very scary indeed! Thanks lads C:
ring set, about $250 with postage from japan http://www.ebay.com.au/itm/190734847925?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 RING SET 12140-05C00 BANDIT GSF250 GJ74A GSX-R250RK GJ73A GSX250F GJ75A ACROSS
Hey Desmo Its not unreasonable to ask them to check the compression, after all...your the customer :Thumbs_up: Kiffsta
Cool stuff, well i went around to a few wreckers today. One had a 48 thou km engine that had a bad cam tensioner and the compression was 120 or so with the guys crap tester that was leaking everywhere, so was a bit iffy over that, and another joint has a few with mid 30 thou km and he's getting back to me with a compression test tommorow. Hopefully that's good and ill grab it! Definitely going to ask them to check it again while I'm there though. Might be a bit pedantic but i think its fair to see the results in person when one's forking out $500+ for it
Desmo, mate you can buy pistion/rings together, but not cheap from this lot http://www.pieces-suz.com/suzuki-recherche-bike-pieces_nn.php?compteur=1375&PartsListID=851509 i will keep hunting and see what i can find. best places to search would be Japan on line motorcycle shops
heres another in russia http://translate.google.com.au/translate?hl=en&sl=ru&u=http://parts.takaoka-vl.ru/%3Fmake%3Dsuzuki%26series%3DGSX250%26model%3D1355%26section_id%3D18400&prev=/search%3Fq%3D12111-05c04%26hl%3Den%26sa%3DN%26biw%3D1280%26bih%3D839%26prmd%3Dimvns&sa=X&ei=P0Z1UN-ELuqaiAeC3IGQBQ&ved=0CEYQ7gEwBQ
Top stuff, cheers for the links In the end it'll be better to just swap it for another engine, given the gearbox is knackered and I'm sure there's a lot of other bits wrong within it (cam lobes are chipped and what not) plus the total parts price will be pretty close to the asking price of a much lower KM engine. BUT definitely will be rebuilding one from something for the sake of it when cash permits! T'is a very satisfying endeavor indeed
