26-07-19, 06:54 AM | #61 | |
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1979 Suzuki X5 Long term rebuild
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What a pity, it is a very nice bike, indeed you have made such a nice job of it that you have to fix it properly. Have you pressure tested the crankcase yet? You are a very competent mechanic, so I’m guessing you know how. It would not take long to rig up some bungs, a pump and a gauge to check out each side with the bike still in the frame. That won’t help fix the issue, but you will know what and where it is. At the very least you will be able to identify whether the issue is with an outer seal or (I suppose much more likely) an inner seal. I rather assume you changed the outer seals on both cylinders as you were building up the motor, but depending on the results of the pressure test I wonder whether it might be worth changing both again. I don’t know that particular engine, but it looks like it is piston ported (well, no disc valves anyway) so the outer seals will be a really simple (and cheap) job. Good fortune. A Sent from my iPad using Tapatalk Last edited by Othen; 26-07-19 at 06:57 AM. |
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26-07-19, 07:17 AM | #62 | |
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Re: 1979 Suzuki X5 Long term rebuild
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It's dead easy to raise / lower the needles in those carbs, have you tried moving the needle clip to see if it improves things? It's also easy to makes a quick test of whether it's rich or lean at mid-range rpm and medium throttle openings - just give it half choke. If it runs with less fluffiness, raise the needle. It it runs worse, lower the needle. Good luck, I hope you can sort it without having to do open motor surgery. |
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26-07-19, 10:53 AM | #63 |
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Re: 1979 Suzuki X5 Long term rebuild
Looks great Mister C!
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27-07-19, 07:28 AM | #64 | ||
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Re: 1979 Suzuki X5 Long term rebuild
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27-07-19, 01:12 PM | #65 |
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Re: 1979 Suzuki X5 Long term rebuild
Lovely
small observation, to me its running a bit dry for a 2t e.g. not enough smoke. if the bike has a tank and pump for the oil try testing the output of the pump or if its new barrels then set the pump to "Run In" for the first 500 miles or so. do a "plug chop" and check the plugs. or it might just be you haven't ridden a 2t for a while... |
28-07-19, 03:52 PM | #66 | |
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Re: 1979 Suzuki X5 Long term rebuild
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31-07-19, 06:00 AM | #67 |
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Re: 1979 Suzuki X5 Long term rebuild
Right, quick update.
The carburation is sorted (well, almost). Apparently, the good old Japanese like to mess with different size carb needles & needle jets within a 2 year lifespan, I had the wrong combination, hence why the bike wouldn't run right. Using a magnifying glass showed that I had the wrong needles fitted after I noticed that I had 2 different sizes in my spares pot. So, with the carbs removed, I fitted the new jets & needles, fired the bike up & went for a short ride. She's running 99% better, but still runs on a little when I come to a stop, so just need to adjust the mixture slightly & she should be right
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31-07-19, 06:46 AM | #68 |
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Re: 1979 Suzuki X5 Long term rebuild
That's great news. Those needles on the left of the pic aren't really needles at all, they're more like pop rivets
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31-07-19, 08:14 AM | #69 |
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Re: 1979 Suzuki X5 Long term rebuild
Great stuff! Any chance of a vid of a fly past on the open road then Col?
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02-08-19, 06:28 AM | #70 | ||
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Re: 1979 Suzuki X5 Long term rebuild
I let my son have a little tootle up his road last night, so videoed it. The bike seems to be running okish now, but I should have rebuilt the crank as the centre bearing is quite noisy now. Obviously 40 years of non use has taken it's toll. She's coming off the road over the winter, so I'll probably strip the engine & send the crank away to Grampian in Liverpool for a rebuild ready for the summer next year.
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