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Z3n posted:I don't even really like 2 strokes but I'm jealous of that thing. Post pics of the rest of your toys! Those are fightin words! Love two strokes, and this is a sweet project. I've always sort of thought we should have a 2-stroke chat thread.
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Dec 27, 2013 22:16
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Ok since this is now the general two stroke chat thread, I'll throw in with my current project. I have a 1975 Kawasaki F11 250 (I'll add pictures when I'm not phoneposting). Great 70's enduro, which means it runs well, but has terrible suspension and maybe OK brakes. The F11 was praised in its day for its good road manners and handling both on and off road, but like most bikes it's age, the suspension didn't stand the test of time. Fast forward 39 years and the forks are atrocious compared to other modern bikes. My off-road experiences with it mostly involve the forks tromboning around and bottoming out. When a co-worker of mine offered me an 88 RM250 in a box with a blown motor for $60 I snapped it right up. For those who don't follow old dirt bikes, the 88 RM250 is widely viewed as having the pinnacle of conventional fork technology. The next generation RM saw a move to USD forks and a reduction in fork performance. The brakes were good too, considering that they ran the same brakes up through 08. So I set forth grafting the complete rm250 front end on to my F11, forks, triples, wheel, brake and all. It's been a maddening journey down the bearing and spacer rabbit hole, but I've got it mounted and working. I'll try to snap some pics tonight.
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Dec 29, 2013 16:04
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Sir Cornelius posted:Can't loving hear you, mate. Holy poo poo, a sir Cornelius post I agree with!!!! My RV90 never ever smokes and has a super reliable lube system. It's not SRIS, but the older CCI was awesome for its time. My kawi 250 that is 3 years newer smokes like crazy till it warms up and smokes only slightly less when it's warm. If it wasn't for the sound, you'd think the RV90 was a 4-stroke. I still run actual 2-stroke oil in mine for the smell  but I have run 10wWhatever one time in a pinch, it did fine.
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Dec 31, 2013 16:14
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I spotted this while playing gta 5, thought it was cool to see in a video game released in 2013. I was playing online and that car creeping in from the right of the frame hit me at about 900 mph a fraction of a second after I snapped the pic and killed me, so at least I got photographic evidence of the two stroke mention. 
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Jan 5, 2014 02:01
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Twas not I. My DG pipes went with my RD
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Jan 6, 2014 05:10
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Skreemer posted:From what little I know of them the suzuki 2-strokes were/are heavy ponderous and didn't handle all that great. Decent bikes and reliable when kept up on maintenance but not enything anyone would go gaga for except collectors of folks that had one back in the day. They are the most reliable two strokes out of the 4 japanese manufacturers, and all bikes from that era were heavy and ponderous, so you may as well go with the one least likely to leave you stranded
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Jan 31, 2014 17:52
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Only the gt750 was water cooled. The rest had that ram air head. The gt's weren't necessarily the most popular, but 40 years on, they're the best.
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Feb 5, 2014 13:19
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Yeah the gt750's were pushed as sport touring bikes and are crazy reliable for any older bike, let alone an older two stroke
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Feb 6, 2014 19:38
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Mostly that the oil pumps inject oil right into the crank bearings. Yamaha just threw it in the carb Venturi, so whatever oil was lucky enough to splash onto the bearings was all you got. Kawasaki eventually went the Suzuki route but suzukis cci was a more mature product.
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Feb 7, 2014 02:20
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n8r posted:Why do you need to inject it into the bearings? All the non road going bikes have is pre-mixed gas and their crank bearings seem to hold up just fine assuming you're running normal ratios. They don't hold up at sustained high rpm. Sustained like "hours on the highway" sustained. You generally need to do RD top ends and sometimes bearings within 10k. Bikes like the gt750 can hit four stroke rebuild intervals. Bikes that run premix or inject like an RD aren't hand grenades waiting to blow up, but they won't do Suzuki cci mileage. Kawasaki in their weird agreement with Suzuki basically lifted cci for their own bikes, called it something else and ran it a bit differently. E: the later suzukis called it something other than cci, the name of which escapes me, but it was the same basic philosophy Beve Stuscemi fucked around with this message at 03:48 on Feb 7, 2014 |
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Feb 7, 2014 03:44
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The TDR is also much more advanced than your average early-mid-70's two stroke. It uses better metals, cooling is better, tighter tolerances, better rings, timing, everything.
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Feb 7, 2014 17:24
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Yeah there is no question that back then and today, the RD's are the most popular.
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Feb 7, 2014 18:26
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DefaultPeanut posted:5:1 dilute of Phosphoric acid after scraping it as clean as I can get it. Last time I let that stuff sit in my rusty RD tank, it went from rust to perfectly bare in 10 minutes. I wouldn't mind giving reverse electrolysis a shot, but what kind of current would one have to pass in order to get a clean tank? Standard car battery charger on the "jump start" mode is what I did. Worked great, I've done it with 4 tanks now
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Mar 6, 2014 16:04
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LOL if you don't have the layout of all carbs memorized 
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Mar 20, 2014 18:39
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Cubs own Buy one and do this: http://youtu.be/JOnErfo2X2k
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Nov 2, 2014 18:22
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Frosty- posted:A little while back I got a '75 Suzuki T500. It had been working OK. The brakes barely functioned and the tires are the originals, so I didn't ride it a lot. It started just fine without a lot of kicking, though, and seemed plenty powerful. Bad petcock gasket. Dont feel too bad about getting a stupid Suzuki stroker, they really were the best of the 70's two-strokes, even though (and partially because) they didnt make as much power as the H1/etc.
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Jan 15, 2015 04:14
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n8r posted:How were they the best? I'd literally never heard of a T500. What makes them better than the RDs of the time? The oiling was much more sophisticated and conducive to longevity. The rd's basically drool oil into the carb Venturi, and oiling is up to air flow. The Suzukis inject oil straight into the bearings, where it needs to be. That enables them to get much longer life while using less oil. Rd's need to be rebuilt every 10-15k, give or take. The GT series could run for an exceptionally long time without a rebuild, so much so that when they combined that excellent oiling with liquid cooling in the gt750, it actually worked well as a touring bike, which is not typically something two strokes were happy about. Now, to be fair, the yamahas always made more power for similar displacement, and nowadays that makes them a bit more desirable than the gt's because no one in tyool 2015 tours on a two stroke, but back in the day when two strokes were common and people used them for utilitarian purposes, the gt's were the hot ticket. Beve Stuscemi fucked around with this message at 01:42 on Jan 16, 2015 |
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Jan 15, 2015 22:00
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| # ¿ Apr 29, 2024 12:10 |
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I will say other manufacturers wised up eventually. Kawi was the first to copy the Suzuki CCI system, Yamaha did later as well, but by then the street two stroke boom was mostly over
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Jan 18, 2015 03:02
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