{"id":546,"date":"2011-10-23T20:41:48","date_gmt":"2011-10-23T20:41:48","guid":{"rendered":"https:\/\/www.whitedogbikes.com\/whitedogblog\/?p=546"},"modified":"2026-04-01T22:56:46","modified_gmt":"2026-04-01T22:56:46","slug":"yamaha-sr250-se-239cc-4-stroke-specs-and-info","status":"publish","type":"post","link":"https:\/\/www.whitedogbikes.com\/whitedogblog\/yamaha-sr250-se-239cc-4-stroke-specs-and-info\/","title":{"rendered":"Yamaha SR250 SE Specs and Info (1980 to 1985)"},"content":{"rendered":"
\"Yamaha<\/figure>\n

The Yamaha SR250 SE was a commuter style 4 stroke<\/a> motorcycle manufactured between 1980 and 1985 (ish!). With styling taken from the Yam SR500<\/a> and SR400<\/a>, the SR 250 was aimed at the popular quarter litre motorbike market (in the UK we used to be able to ride a motorcycle up to 250cc on a car license without the need to take any further motorbike tests).
\nThe SR250 was available in other countries and was called the SR250 Exciter<\/a> in the USA.
\nThe SR250SE proved to be (and still is) a popular and reliable commuter bike. <\/p>\n

\"Yamaha<\/figure>\n

Need parts for your SR250? Find SR250 spares…<\/a><\/strong><\/p>\n

A little bit about the Yamaha SR 250 SE…..<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Basic model info…<\/span><\/strong><\/h3>\n<\/th>\n<\/tr>\n<\/thead>\n

Manufacturer:<\/strong><\/td>\nYamaha<\/td>\n<\/tr>\n
Model:<\/strong><\/td>\nSR250 SE<\/td>\n<\/tr>\n
Also known as (aka):<\/strong><\/td>\nSR250 Exciter<\/td>\n<\/tr>\n
CC:<\/strong><\/td>\n239cc<\/td>\n<\/tr>\n
Engine type:<\/strong><\/td>\nSingle cylinder (4 stroke)<\/td>\n<\/tr>\n
Years in production:<\/strong><\/td>\n1980 to 1985<\/td>\n<\/tr>\n
Style of bike:<\/strong><\/td>\nCommuter<\/td>\n<\/tr>\n
Insurance:<\/strong><\/td>\nGroup 4 (of 17)<\/td>\n<\/tr>\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\"Yamaha<\/figure>\n

1981 Yamaha SR250 SE engine<\/strong><\/p>\n

Engine, gearbox and drive stuff…<\/strong>
\nInformation: SR250 Service Manual<\/a>
\nYamaha engine code: 3Y8
\nDisplacement: 239cc ccm
\nEngine type: Air cooled, four stroke, single cylinder, SOHC (single overhead cam)
\nBore x Stroke: 73.5mm x 56.5mm
\nInlet valve clearance (when cold): 0.05mm to 0.10mm
\nExhaust valve clearance (when cold): 0.12mm to 0.17mm
\nGasket: Engine gaskets<\/a>
\nRecommended engine oil (4T): 10w40 Semi Synthetic motorcycle oil<\/a>
\nEngine oil capacity: 1.3 litres (1.6 litres if the oil filter is changed as well)
\nOil filter: Filtrex OIF018<\/a> \/ Hiflo HF145<\/a> \/ K&N KN-145<\/a>
\nCompression Ratio: 8.9:1
\nFiring order: If your looking for the firing order you might want to read this book<\/a> (hint, it’s a SINGLE CYLINDER engine)! \ud83d\ude42
\nPower: 20 bhp at 7700 rpm
\nTorque: 13.7 ft-lb at 7000 rpm
\nStanding \u00bc Mile time: 16.3 sec
\nCooling system: Air cooled
\nGearbox: 5-speed
\nClutch: wet (oil immersed), multi plate clutch<\/a><\/p>\n

Note:<\/strong> You’ll need a clutch holding tool<\/a> for removing it, a clutch lever<\/a> if you’ve dropped it and possibly a clutch cable<\/a> if it’s suddenly stopped working!<\/p><\/blockquote>\n

Final drive: Chain (chain and sprocket kits<\/a>)
\nDrive chain length: 102 links
\nDrive chain pitch: 520
\nFront sprocket teeth: 16
\nRear sprocket teeth: 45<\/p>\n

Note:<\/strong> Some models had a slightly smaller, 15 tooth front sprocket instead of the standard 16 tooth front sprocket (if your replacing your old sprocket, count the teeth to see which one you have!)<\/p><\/blockquote>\n

Top speed: 89 mph….Ish!<\/p>\n

Please note –<\/strong> The 89mph top speed was Yamaha’s estimated top speed (used on their marketing bumph!) back in the 1980’s. As with most marketing stuff, this should be taken with a pinch of salt (most manufacturers inflate the top speed figure in their marketing leaflets as it helps increase sales!).<\/p><\/blockquote>\n

\"Yamaha<\/figure>\n

Side view of a (very scruffy!) 1981 SR250 SE<\/strong><\/p>\n

Carb and fuel stuff…<\/strong>
\nCarb type: 34mm Mikuni carburetor (carb parts<\/a>)
\nCarb type: BS34-III
\nPilot screw opening: 2 turns
\nFloat height level: 3mm (+ or – 1mm)
\nEngine idle speed: 1200 rpm
\nFuel tank capacity: 10.8 Litres
\nAverage MPG: 70 mpg (miles per gallon)
\nFuel tap: On the left side of the tank, behind the engine – Petrol tap repair kits<\/a><\/p>\n

\"Yamaha<\/figure>\n

1981 Yamaha SR250 SE carburetor and engine<\/strong><\/p>\n

Electric stuff…<\/strong>
\nIgnition type: Electronic CDI
\nCDI manufacturer: Hitachi
\nCDI part no: 3Y6 and TID11-02
\nVoltage: 12 volts
\nRegulated voltage: 14.8 volts (regulator\/rectifier<\/a>)
\nIgnition switch: Center mounted handlebar key operated ignition Switch<\/a>
\nPlug coil primary resistance: 2.48 to 3.00 ohms
\nPlug coil secondary resistance: 6320 to 9480 ohms
\nPick up coil resistance: 630 to 770 ohms
\nPick up \/ contact breaker gap: 0.6mm
\nMax alternator output: 8 amps at 4000 rpm
\nStarter type: Electric starter motor
\nBattery: Yuasa YB12A-A<\/a>
\n\/ AC\/Delco AB12AA<\/a>
\nSpark plug: NGK BP7ES<\/a>
\n – Champion RN7YC<\/a>
\nSpark plug gap: NGK 0.7mm to 0.8mm – Champion 0.8mm<\/p>\n

\"Yamaha<\/figure>\n

1981 Yamaha SR250 SE speedometer and warning lights<\/strong><\/p>\n

Exhaust system…<\/strong>
\nType: 1 into 1 system
\nGasket: 45mm (outside diameter) x 38mm (inside diameter) x 5mm (depth) exhaust gasket<\/a><\/p>\n

\"Yamaha<\/figure>\n

1981 Yamaha SR250 SE back drum brake<\/strong><\/p>\n

Shocks, brakes and wheels…<\/strong>
\nFront tyre size: 3.00-18 (300-18)<\/a>
\nFront inner tube: 275\/300-18<\/a><\/p>\n

Note:<\/strong> There seems to be a bit of confusion over if the SR250 had a 19 inch or 18 inch front wheel. The few we’ve had in all had 18 inch front wheels, but most tyre reference books say they have 19 inch front wheels (so best to check your old tyre before buying a replacement!)<\/p><\/blockquote>\n

Rear tyre size: 120\/90-16<\/a>
\nRear inner tube: 500\/510-16<\/a>
\nFront tyre pressure (if your on your own): 1.8 bar \/ 26 psi
\nFront tyre pressure (if your carrying a pillion): 2.0 bar \/ 29 psi
\nRear tyre pressure (if your on your own): 2.0 bar \/ 29 psi
\nRear tyre pressure (if your carrying a pillion): 2.3 bar \/ 33 psi
\nFront brake: Drum (expanding) brake (front brake lever<\/a>)
\nFront brake shoe: EBC Y511 \/ Vesrah VB-220<\/a>
\nRear brake: Drum (expanding) brake
\nRear brake shoe: EBC Y506 \/ Vesrah VB-223<\/a>
\nFront wheel type: Spoked wheel (front wheel bearings<\/a>)
\nRear wheel type: Spoked wheel (rear wheel bearings<\/a>)
\nHead bearings: steering head bearing kit<\/a>
\nFront Suspension: 32mm Telescopic forks (fork seals<\/a>)
\nFront fork oil type: 10w (medium weight)<\/a>
\nFront fork oil amount: 168ml (per fork)
\nRear Suspension: Twin shock (with preload adjustment)<\/p>\n

\"Yamaha<\/figure>\n

1981 Yamaha SR250 SE front brum brake<\/strong><\/p>\n

Weights ‘n other stuff…<\/strong>
\nWet weight (inc oil, petrol, etc): 122 kg
\nTachometer: Cable operated<\/a>
\nSpeedometer: Cable operated<\/a><\/p>\n

Useful tightening torques…<\/strong>
\nCylinder head (1st stage): 37.5nm
\nCylinder head (2nd stage): If M8 bolts, 20nm – If M6 bolts, 10nm
\nMagneto \/ flywheel: 80nm
\nCamshaft sprocket: 55nm
\nCrankshaft sprocket: 70nm
\nClutch hub: 70nm
\nSpark plug: 20nm
\nFront wheel spindle: 106nm
\nFront wheel spindle clamp (the ones in the fork leg): 22nm
\nRear wheel spindle: 106nm<\/p>\n

\"Yamaha<\/figure>\n

1981 Yamaha SR250 SE front view<\/strong><\/p>\n

Other stuff…<\/strong>
\nAlthough the SR250 SE was never going to set the motorcycle world alight and wasn’t really all that much to look at, the bike proved very popular with commuters, people looking for their ‘first big bike’, younger riders, city couriers and people looking for a winter hack. Good Yamaha build quality and a fairly bulletproof engine means there are still a fair few around (meaning they are also cheap to pick up now, usually under \u00a3500 for a good, road ready example!)<\/p>\n

Buying advice…..<\/strong>
\nAs with all Yamaha’s of this age, the electrics can be a bit corroded and problematic (especially in the rain!).
\nAlso, the metal and chrome parts will have seen better days, a bit of rust around the tank, forks and chrome parts is common and nothing to worry about but watch out for bad rot, especially on the exhausts and forks as finding good and none bank account emptying exhausts and forks can be tricky!<\/p>\n

Sources:<\/strong>
\nBikez.com<\/a>
\nMotorcycle Specs<\/a><\/p>\n

Disclaimers:<\/strong>
\nThe Yamaha SR250 SE specs and information on this page are correct to the best of our knowledge. But the info should NOT<\/strong> be taken as 100% accurate as we can, occasionally, make mistakes (despite rumors, we are only human!!)!<\/p>\n

To keep this page as a free resource for people to use, there are affiliate links (mainly Amazon) throughout the article. These affiliate links help maintain the cost of running this blog (basically, if you visit Amazon through one of the links and buy something, we make a few pence!).<\/p>\n

If you have any 1980 to 1985 Yam SR250 questions, please post them below \ud83d\ude42<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

The Yamaha SR250 SE was a commuter style 4 stroke motorcycle manufactured between 1980 and 1985 (ish!). With styling taken from the Yam SR500 and SR400, the SR 250 was aimed at the popular quarter litre motorbike market (in the UK we used to be able to ride a motorcycle up to 250cc on a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[4],"tags":[60,159,160],"class_list":["post-546","post","type-post","status-publish","format-standard","hentry","category-motorbike-breakers-specs","tag-motorcycle-specs","tag-sr250-se-specs","tag-yamaha-exciter-info"],"featured_image_src":null,"author_info":{"display_name":"WhiteDogBikes","author_link":"https:\/\/www.whitedogbikes.com\/whitedogblog\/author\/wd-admin\/"},"yoast_head":"\nYamaha SR250 SE Specs - Yamaha SR 250 Exciter Info<\/title>\n<meta name=\"description\" content=\"Specifications and information about the 1980 to 1985 SR 250. 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