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 Post subject: 80 rm400
PostPosted: Fri May 12, 2017 4:54 pm 
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On the street

Joined: Tue Nov 01, 2016 11:33 am
Posts: 20
Country: United States
Bikes owned: Gs1000g gs850g ds80 tc185
Sunday morning im trading my gs1000 for an rm400, the guy states the engine is fresh top to bottom ( new bearings, sleave, piston, and gaskets.) And from the video he sent me it is very nice running bike. It has the wrong fenders and missing the left number plate. What im wondering is, what are things to look for.. its clean enough that it'll just need some tlc and correct plastics.. from pics. Are there weak spots in the frames? Will i die? How reliable is it? What mixture should i use. I use caster oil and 93 pump.
And finally a couple pictures.. ignore the forward swept handlebars lol
Image
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 Post subject: Re: 80 rm400
PostPosted: Fri May 12, 2017 6:15 pm 
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To the on ramp
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Joined: Sun Feb 21, 2016 8:32 pm
Posts: 266
Location: Wichita, Kansas USA
Country: USA
Bikes owned: GT500 T500 GT750
I'd ask to see receipts. And if I'm not mistaken the 400 pistons are getting very rare/pricey. All the PE's and RM's from that era have a good reputation.


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 Post subject: Re: 80 rm400
PostPosted: Mon May 15, 2017 2:54 pm 
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AMA Superbike
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Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1656
Location: Blythewood, SC, USA
I find it curious that it has a taillight. RMs would not have a taillight, RMXs would have a tillight, but would be four-stroke!


Lane

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If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


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 Post subject: Re: 80 rm400
PostPosted: Tue May 16, 2017 12:47 am 
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AMA Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 1834
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
http://www.suzukicycles.org/RM-RMX-seri ... l~isoraami

Personally, I would never use castor based oils in premix as it will turn to snot in the bearings and will need cleaning very regularly.
Remember, it's a racing oil and would be used on engines that would be stripped after every race.
If you intend racing it, use a synthetic oil, if using it 'normally' use a less expensive semi synthetic oil.


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 Post subject: Re: 80 rm400
PostPosted: Tue May 16, 2017 4:02 am 
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Yeah Man, the Interstate

Joined: Tue Dec 16, 2008 11:37 am
Posts: 737
Location: Trowbridge UK
Country: UK
Bikes owned: T500R, SV1000S, TS125, Seeley T500
Alan H wrote:
http://www.suzukicycles.org/RM-RMX-series/index.html?RM400.shtml~isoraami" onclick="window.open(this.href);return false;

Personally, I would never use castor based oils in premix as it will turn to snot in the bearings and will need cleaning very regularly.
Remember, it's a racing oil and would be used on engines that would be stripped after every race.
If you intend racing it, use a synthetic oil, if using it 'normally' use a less expensive semi synthetic oil.


Hi Alan,

I used Castrol R30 via the std. oil pump on my Seeley T500 back in the day and did not have any "snot in bearings" issues. The engine was certainly not stripped after every race (it wasn't a TZ350 lol :D ). I currently use Castrol A747 @ 20-25:1 pre-mix in the replica Seeley with no issues.

I agree though, a modern semi or full synthetic oil is probably a good way to go. Just don't believe that you can go to 100:1 type ratios and mix at the recommended Suzuki ratios (25:1 should be a safe start).

Cheers Geoff


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 Post subject: Re: 80 rm400
PostPosted: Tue May 16, 2017 5:03 am 
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AMA Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 1834
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
Fairy nuff Geoff.
I just posted that comment after a good friend of mine used a castor based oil in a GT750 and when he stripped it at the end of that year, the bottom end was toast and everything was bunged up with castor gunge. The snot comment was his description!
We used to use a small amount in petrol back in the day so we had the 'Castrol R' smell, but anyone who used it as engine oil had issues when it was used as a daily rider. Perhaps if an engine isn't used at max for long periods and not hitting the top end of temperature cycles for long periods as it would with a race engine? Plus regular oil changes of course with 4 strokes.
Personally, I keep well away from castor based stuff and use semi 'sympathetic' in my Suzuki triple CCI systems and 20w40 or similar in the gearboxes and it works fine for 'normal' running and an occasional thrash.
No CCI on the RM's I know, so it will depend on what use it gets as to what it needs.
Nice looking bikes but maybe a bit mental for my tastes nowadays - another mate has a TS400 and that's just great.


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 Post subject: Re: 80 rm400
PostPosted: Tue May 16, 2017 7:40 am 
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Yeah Man, the Interstate

Joined: Tue Dec 16, 2008 11:37 am
Posts: 737
Location: Trowbridge UK
Country: UK
Bikes owned: T500R, SV1000S, TS125, Seeley T500
Hi Alan,

I think the racing comment is fair play. A race engine is not usually trickled around town with resultant build up of un-burnt castor etc. I can see how it could be an issue on a road GT750. I do know that on a 4-st if you have been using R40 and want to change to a mineral or modern synthetic the WHOLE engine usually needs stripping and cleaning to get rid of the castor.

Cheers Geoff


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