Thumper Club Forum
Technical => Bike Problems/Questions => Topic started by: DoubleDiamond on January 08, 2019, 01:34:40 PM
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I'm currently trying to get a letter from Yamaha (UK) to confirm the power output of my 1991 SRX400 - this should be about 32bhp - so that it can be used to take an A2 driving test.
However, the number on both (I have a spare) my engines (one has an electric start) have the designator 5Y7 stamped on them. Yamaha tell me that this number relates to a 1982 XT400 engine.
Can any of you good people shed a light on this please? What is the designator for the SRX600 of similar vintage?
TIA
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Aye Double Diamond,
A 1991 SRX400 engine is identified by the code '3VN' or '3VN' in front of the specific unit number, stamped into the ridged area on the upper rear right hand case.
A 1991 SRX600 engine is identified by the code '3SX', located as for the 400cc engine.
A 1991 SRX400 monoshock was sold with an electric starter. I believe (and stand to be corrected :-\ ) that a monoshock fitted with a kickstart engine is a hybrid.
I too have a 1991 SRX400 monoshock fitted with an alternative engine that is a 1990 XT600E engine, with the engine prefix '3TB' that indicates that it is a 1990 engine.
For a full and comprehensive article upon model codes attributed to the SRX range of motorcycles, I would recommend reading this article: SRX_model_codes (http://www.srx600.net/models/greyimportmodels.php&heading=Grey%20Import%20Models) I suggest that this website is worthy of a detailed view.
The following is a link to the Fowler's spare parts web list concerning the SRX400 model: Fowler's_SRX400_parts_list (https://www.fowlersparts.co.uk/browser/manufacturer/yamaha/bike/srx400) Depending upon the model year selected, the relevant alpha-numeric code will be displayed.
I realise that this may raise more questions than it answers, but hope that it helps you in extracting the required letter from Yamaha (UK).
My regards, Bill
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Hi.... as Bill has indicated... this is a bit of a minefield.... so let me muddy the waters a little further :-)..
i have 4 srx 400 engines under my bench , i have checked them and they are all 5Y7.... as far as i'm aware they are 1986-87.
my road going srx600 is 1986 and carries the 1JK stamp, which i think says it's a Japanese market model (grey import)
I also have an XT600 engine, date unknown stamped 8AJ
but i am now going to study the link Bill sent regarding SRX codes.... sounds like good bedtime reading
good luck