SZR660 thread (belgarda alloy frame bike with xt motor) anyone with info/mods/links?

[hypoboang]

been searching for a while and cant find alot of info out there about these bikes. Plenty of pics but not much in the performance mods.
I just picked one up and was hoping to share some info.

I'm hoping to eventually fit a xt660r engine to it. fuel injection and all...
lets see how we go!
heres the bike:

[Madness]

I don't think they ever came to N.Z so you might be struggling to find information here. I had certainly never seen one before your posts.

[hypoboang]

some specs:

Engine - 4 stroke, SOHC Liquid cooled 5 valve single. Bore x Stroke - 100 x 84mm
Displacement - 659cc
Compression Ratio - 9.2 :1
Lubrication - Dry sump
Ignition - TCI (Digital)
Starter - Electric
Transmission - 5-speed
Final Drive - 'O'-ring sealed chain
Dimensions (LxWxH) - 2,049 x 740 x 1,140 mm
Wheelbase - 1410mm
Seat Height - 770mm
Ground Clearance - 145mm
Fuel Capacity - 14 litres (2.5 reserve)
Wheels (Front/Rear) - 'U'-section 3-spoke cast aluminium
Tyres (Front/Rear) - 110/70-17 150/60-17
Suspension (Front/Rear) - Inverted telescopic forks / Monoshock
Brakes (Front/Rear) – Brembo Four-piston caliper on single disc / Brembo two-piston on single disc
Dry Weight - 159kg

[hypoboang]

and a little more about it from wiki:

Yamaha SZR660 is a single-cylinder sportbike produced by Yamaha Motor Corporation from 1996 to 2001. It shares engine with Yamaha's XTZ660 Ténéré line of dual-purpose on/off road motorcycles, but employs this engine within a Supermono package.
The 659-cc single-cylinder bike makes the most of its relatively modest power output by virtue of its light, stiff frame.
The Yamaha SZR660 was built in Italy and equipped with Italian made Paoli[disambiguation needed] USD (Up Side Down) front forks and Marzocchi rear shock-absorber.
The chassis is from the Belgarda (Yamaha Italy) TZR 250 Sports two-stroke road bike. The engine is from the Yamaha XTZ660 Ténéré Trail machine, so this bike is a hybrid. It was imported into Australia in small numbers by enthusiastic private Yamaha dealerships and was never a mainstream Yamaha Australia Model. In original pricing it exceeded $10,000, but values dropped after a few years. Today the acceptance of the SZR660 as a Learner Approved Motorcycle in most states has refirmed its values. As a learner bike it would provide reasonable performance and reliability.
The SZR660 is a testimonial to the development of CNC engineering. The proximity of the engine to the chassis and other components is demonstrably smaller than many other models and this machine could not have been built to such a standard in earlier years. Regular maintenance on this engine in such a confined space will definitely challenge the average owner. (for instance, to change the spark plug it is essential to use the special tool supplied in the kit (with a sponge internal plug "gripper") as well as removal of: the mirrors; fuel tank and dropping the radiator from its rubber mountings.
The 660 engine incorporates a five valve cylinder head, one of the last Yamahas manufactured with such a feature. There are three intake and two exhaust valves. The theory is that the smaller valves have a larger area at a lower weight than a four valve system and allow maximum intake flow and velocity.
The 660 engine has a unique external dry sump, in order to reduce overall engine size compared to a traditional wet sump engine.
The fuel tank incorporates an inbuilt fuel pump, to lift the contents of the tank to the twin carburettors.
The fuel system incorporates one slide carb and one butterfly carb. These are operated sequentially by a manually adjustable system.
Performance wise the chassis shines. Experienced motorcyclists have said that the bike is "the best handling machine I have ever ridden". Unfortunately the engine performance means that these statements are made after long descents. The SZR has difficulty exceeding 160 km/h in stock form, with its bulky muffler and restrictive carburettor system.
Comfort wise the chassis was designed with Junior Italian riders in mind, so it can be a little cramped, but the seat is comfortable and the vibrations of a big single are well dampened. The unique styling of the fuel tank can lead you to experience an unintentional "heimlich maneuver" when travelling downhill and hitting a large bump, but that's the worst that can happen to you on this bike.
Ownership Tips As the SZR is electric start only, make sure the battery is well maintained (it's a small battery for such a big engine) and if you manage to push start one of these bikes on a flat battery I believe you will need to be an olympic athlete.

[hypoboang]

thanks for the reply madness. yeah I did a search and one came up in trade me so I was hoping someone may have had experience with them on this site. interesting bikes though...

Im also after any info on power mods to the xt660 (carb) engine.
theres a guy on here that have done the raptor 700 mod to get an extra 25% power increase out of his injected 660r. I dont want to go that far (also mine has the earlier carbed engine), but some info on stroking or increasing bore would be good...
ill keep looking...

[Glowerss]

Do you have a particular interest in one of these?

They are one of the best LAMS bikes you can get. I'm not sure how much you paid for it, but RB welly sold one for I think 6k+ not too long ago.

Just a heads up before you go tearing it to bits

[GSF]

Never heard of one of these before. Big single in a sprotbike package sounds like fun!

[HenryDorsetCase]

That is a cool bike

[Eddieb]

Have a search on UK sites, there were a few there in the mid-late 90's

[SVboy]

Search the "projects" thread on the Performance bikes forum. I believe it is quite hard to lift the performance of these motors without lots of $$$added. However-lots of potential to add lightness to the bike I believe.

[imdying]

Generally regarded as being a shite box that wastes a TZR chassis, they have however been repurposed with decent motors more than once.

[F5 Dave]

So you're thinking RZ350 engine? New tailpiece, grafted tank. Could be onto something.

A friend had one in the UK, but she didn't bring it back.

[hypoboang]

haha, not bad. yeah theres some hot looking ones on some of the UK sites. and yep- i loved the RZ350... wasnt there a 500 as well? how about a 750 k2 kawasaki triple (2 stroke)... now that would be fun!
as for repowering I'm just looking into a 2mm oversized piston and a rebore at the moment. that should bring it up to about 680cc or a bit more... getting there!

here in aus its hard to put an older engine into a later framed bike (sorry, its easy really, but hard to get passed for rego due to ADR compliance laws, mainly to do with emissions). no problem putting a later model engine in a earlier model bike but who would want to do that? (fast bike with shiny new engine but handles like a bag of s--t.).. yeah the szr would be a great bike with the dual exhaust and EFI. a power commander and some other tweaks... I'm still thinking along those lines...

[F5 Dave]

My 350 is a 500, but lets not get into that. When I started it was a 350 it was mounted in a 250 chassis & had been registered in WA, so maybe you need to go west young man. I think the heat makes them more lenient. Maybe its not much cooler there sorry.

Why so keen on EFI? hard to beat a good carb setup. No need for expensive PCmdrs, just drilled bits of brass.

[GrayWolf]

haha, not bad. yeah theres some hot looking ones on some of the UK sites. and yep- i loved the RZ350... wasnt there a 500 as well? how about a 750 k2 kawasaki triple (2 stroke)... now that would be fun!
as for repowering I'm just looking into a 2mm oversized piston and a rebore at the moment. that should bring it up to about 680cc or a bit more... getting there!

here in aus its hard to put an older engine into a later framed bike (sorry, its easy really, but hard to get passed for rego due to ADR compliance laws, mainly to do with emissions). no problem putting a later model engine in a earlier model bike but who would want to do that? (fast bike with shiny new engine but handles like a bag of s--t.).. yeah the szr would be a great bike with the dual exhaust and EFI. a power commander and some other tweaks... I'm still thinking along those lines...

Wow hypobang, you want to dive to an H2? "would be fun" There was a lot of Cemetery real estate used up by blokes who thought that of the H1/H2's when I was a lad! I owned a 500, most memorable bike I've ever owned, for all the wrong reasons as well as the (for then) rocketship performance.
Sadly you live in the land of long flat straight roads. You need to move here (NZ) where that lil beauty (SZR) will shine on the back roads and hills. Really you've already found all the relevant info for tuning (I had an XTX660 tenere') and that was about all you could do for BIG improvements (raptor mod).... It's as fast as any of the big singles GB500, 650 freewind, SR500 etc. Just enjoy it for what it is, (its faster than an Enfield)