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Fuel System / vm34 with pods
« Last post by dailydose1 on August 16, 2018, 07:13:15 PM »
Anyone have their jetting for using vm34's with pods? I cant find anything via search besides that people have done it
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Is this the bolt in the bottom left side of the oil Sump? If so Babbit's shows it as available.

https://www.babbittsonline.com/oemparts/a/yam/50041875f8700209bc785014/oil-pump-oil-cleaner

Guy
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I need a new oil drain bolt. It's the smaller of the two (m14 1.5 pitch). As per previous conversations here it needs exactly 20mm of thread.
Tinternet is full of m14 1.5 similar bolts but not with 20mm of thread.

Anyone know a direct swap from another machine or where I can get a replacement?
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Engine & Transmission / Re: 75 xs500 cutting out.
« Last post by Onlyboards on August 15, 2018, 02:07:11 AM »
I would try some positional trial and error with your plug caps. Not just on the spark plug itself, but the junction of the plug cap and the wire itself.  I also bought new ones and I had the exact same problem with only one cylinder cutting out every once in a while.  I too replaced all the same parts.  Sounds like that may be your culprit seeing as how a "spark plug" change seems to fix it every once in a while.  Everything else you've mentioned seems to check out.

I'm no expert on these things, but they're old.  And more than a couple times I've run into "positional" fixes.
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Engine & Transmission / Re: 75 xs500 cutting out.
« Last post by dailydose1 on August 14, 2018, 05:19:30 PM »
Are you making sure your doing your points on the compression stroke? Do you have power everywhere and its still not starting? Getting a spark both cylinders
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Engine & Transmission / Re: 75 xs500 cutting out.
« Last post by Jay2903 on August 14, 2018, 03:11:15 PM »
You could try to refurb those points before buying new ones if you wanted (usually a small file)


-I would def try iridum plugs if you haven't (took care of a very similar problem on my cb350)
-Are plugs fouled when you take them out?
-Have you tested coils? I have had a "new" coil be bad from manufactuer
-What size battery do you have? What voltage are you getting at it?

This sounds to me more like a short or bad electrical connection than it does any problem with your parts to be honest.
Iíve already ordered some new points, they look fine but thatís the last thing I havenít replaced. I did try iridium plugs, I think theyíre in now actually.

Plugs look about right when I take them out

I havenít tested the new coils but I will do. I tested the original ones which were okay but I changed them Anyways. I put the old ones back on the other day but the bike still wonít start.

I have a new sealed battery, itís fully cartged using the appropriate charger.
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Engine & Transmission / Re: Connecting Rod Bearings
« Last post by guylr on August 14, 2018, 01:44:44 AM »
Good plan. Cranks were heavier from the 75 model on.

Guy
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Engine & Transmission / Re: Connecting Rod Bearings
« Last post by Onlyboards on August 14, 2018, 12:44:25 AM »
awesome.  know any people with any decent crankshafts for sale? haha!!! my measurements were off on the journals.  my crank is toast.   looking for one of the heavier ones from the later models probably.
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Engine & Transmission / Re: Connecting Rod Bearings
« Last post by guylr on August 13, 2018, 11:18:23 PM »
You either have to weld up the journal and remachine it to original size or trash bin the crank.

Guy
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Engine & Transmission / Re: 1975 xs500b runs great for 20min then dies everytime???
« Last post by guylr on August 13, 2018, 11:15:05 PM »
Your coils are right on spec. The caps are just in also but at the top of spec. I'd say all good. Voltage drop at the coils is also good but your battery is on the low side even though the charging numbers are right on.

A clogged oil filter would just bypass to the sump so no extra strain on the engine.

Did you happen to strobe the timing with a timing light. That's a good thing to do on these bikes with the centrifugal timing governors.

Maybe double check those valve clearances especially as you started out with some stuck ones. Set at the middle to loose side of spec and not on the tight side.

Guy
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