Viper Racing UK SK250S - Engine Information

Hi Guys

Here is an image of the Honda "donor parts" required to build any of the new engines, which are all based around the Honda case-reed motor primary drive/clutch/selector mechanism and transmission.

[URL=http://s186.photobucket.com/user/Viperracinguk/media/EvoHondaKit_zpsdfcfe654.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/EvoHondaKit_zpsdfcfe654.jpg[/img][/URL]

We can supply these components in brand new or part new/part used reconditioned format from stock. We would always recomend new bushes, thrust washers and circlips in the trans, a new clutch basket and plates and new wearing parts like gear selector pawls and any bearings. Generally the gears and shafts are pretty bullet-proof. New is always best, but not always possible due to budget constraints.
The gears on the left are our alternative ratios and you can see they are Superfinished.
We are also able to Superfinish the whole of the geartrain/selector mechanism, if the customer wishes.

[URL=http://s186.photobucket.com/user/Viperracinguk/media/superfinishedparts_zps1aa33ef3.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/superfinishedparts_zps1aa33ef3.jpg[/img][/URL]

The engine can also be offered in 6-speed format if required (only new parts of course at present). This isn't applicable for the UK, were F250 National is limited to 5-speed only (with the exception is the Rotax 257 in 6-speed format), although there are non currently running at long circuit in the UK. Here's a picture of our 6-speed transmission:

[URL=http://s186.photobucket.com/user/Viperracinguk/media/6speed_zpsc4f3f567.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/6speed_zpsc4f3f567.jpg[/img][/URL]

The engine can be supplied as a self-build kit, with or without the Honda parts or can be built by us using the customers own donor parts or new/reconditioned parts supplied by us.

Best Regards

Ian :)

Hi Allan

The official launch of the Viper Racing UK SK250S is on Thursday at the Autosport International Show at the NEC, Birmingham, UK.

I will be posting up a couple of pictures and all the pricing detail on the various websites and Forums (including this one) on Wednesday night and/or early Thursday morning.

I hope that you can wait until then!!

In the meantime, here is the engine logo.

[URL=http://s186.photobucket.com/user/Viperracinguk/media/ViperSK250SLogo_zpse6c482c1.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/ViperSK250SLogo_zpse6c482c1.jpg[/img][/URL]

Best Regards

Ian :)

Hi Guys

Here are some pics of the completed Viper SK250S from The Autosport International show.

Prices are from £3,500.00 for the Honda CR250 conversion kit to £5,995.00 for a fully built version complete with exhaust, ignition and carb built using all new parts. We'll build for free including dyno running and optimisation if applicable.

[URL=http://s186.photobucket.com/user/Viperracinguk/media/DSC00782_zps93d37d80.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/DSC00782_zps93d37d80.jpg[/img][/URL]

[URL=http://s186.photobucket.com/user/Viperracinguk/media/DSC00786_zps12d972ff.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/DSC00786_zps12d972ff.jpg[/img][/URL]

[URL=http://s186.photobucket.com/user/Viperracinguk/media/DSC00785_zps2df42cf9.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/DSC00785_zps2df42cf9.jpg[/img][/URL]

Links to pricelists, etc. as follows:

Viper SK250S Pricelist inc ancillaries and running spares:
https://www.dropbox.com/s/b2rl7yewz2t49gf/Copy%20of%20SK250S_Price-List_09.01.14.pdf

The prices given for new Honda Parts Kits (transmission, selector mechanism and clutch/primary drive are applicable to the other kit engines (THR and DEA) as well!

New Self-Assembly Pricing showing huge (£1,200.00) saving in buying a full ready ready to race SK250S engine package.
https://www.dropbox.com/s/zpgguzxg563jed0/SK250S_Self-Assembly_Pricing_09.01.14.pdf?dl=0

Viper Racing UK Engine Package Pricelist (SK250S and Honda CR250)
https://www.dropbox.com/s/xn2sx4lrz3j1cty/Viper_Racing_UK_Engine_Price_List_2014.pdf

If the PDF's open a bit distorted (sometimes happens with dropbox), just e-mail sales@viper-racinguk.co.uk for your own copy sent directly to your e-mail address.

More details to follow after completion of UK registration at the end of the month.

Best Regards

Ian :)

Hi Allan

We're hoping that the SK250S will have it's first outing on track at Oulton Park on Feb 18th, so around that time we should be ready to release a dyno-graph or 2.

What matters of course is how it stacks up against the opposition. Never seen a dyno fitted to a racetrack ;)

Best Regards

Ian :)

Hi Allan

The 6 speed gearset is totally bespoke. Not a Honda part in there (except for some shims!!)

Shafts, gears, forks, drum all 100% British made!

A £2,000 outright purchase to go in a Honda CR250 crankcase induction/Viper SK250S or as a £1,300.00 upgrade on a new engine package of either variety.

Our registration inspection is at 2.30pm tomorrow (Friday 31st Jan).

Best Regards

Ian :)

Hi Allan

It's registration not homologation, but that amounts to the same thing, but Yes, that's correct.

The MSA (British Motorsports Association) registration consists of 2 parts:

1. Paperwork submitted (must have been completed by 01.12.13)
2. Inspection (must have been completed by 31.01.14)

Once both parts have been successfully completed, the Engine will be registered with the MSA as an eligible F250 National Engine for the period 2014 and 2015.

Our 6-speed option cannot be MSA registered as UK F250 National is a 5-speed class.

Best Regards

Ian :)

Hi Allan

Most of the common spares prices are on the first link after the 3 photos above.

I will be formulating a CR250 conversion kit price over the next couple of weeks once exhaust testing/development is complete.

That will be:
1. Overall Kit price
2. Cylinder Head/Insert
3. Cylinder c/w studs, nuts and bolts
4. Piston Kit - £155.00
5. Exhaust Stub
6. Crankshaft
7. Exhaust

Best Regards

Ian :)

Hi Allan

Yes they will. We've been running that format with Mark Stansfield since just after midd 2013 helping us to develop those parts for the SK250S

[URL=http://s186.photobucket.com/user/Viperracinguk/media/EVO_zpsec8d541a.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/EVO_zpsec8d541a.jpg[/img][/URL]

Best Regards

Ian :)

Unfortunately the "Big News" is delayed until the 15th March at Silverstone.

The dyno out of action for best part of a week, and jsut a general lack of time, ensured that we were not ready to hit the track.

On the positive side, the rubber stamp of MSA approval has been received for both the SK250S and the EVO250S engines.

Here's an image of the bare crankcases, by way of compensation!!

[URL=http://s186.photobucket.com/user/Viperracinguk/media/CrankcasesBolts_zpsa29647da.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/CrankcasesBolts_zpsa29647da.jpg[/img][/URL]

Best Regards

Ian :)

Hi Allan

No not yet. Soon as I feel it's appropriate, I'll post up the info.

I think you mean the BSA forum. Just died the death.

Facebook Superkart Drivers Page has really taken over, I suppose: https://www.facebook.com/groups/534983186517728/

Best Regards

Ian :)

Hi Guys

Here's a picture of the Viper SK250S installed in Mark Stansfield's chassis.

Still quite a few jobs to complete, but hoping to start running in the next day or two.

[URL=http://s186.photobucket.com/user/Viperracinguk/media/SK250SInstalled_zps31cd8636.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/SK250SInstalled_zps31cd8636.jpg[/img][/URL]

Soon the dream becomes a reality!

Best Regards

Ian :)

Hi Allan

I see that the perspective got you fooled!! :D

Without wanting to give too much away . . . . . . . . .

It's the girth that's "unusual" rather than the section lengths ;)

[URL=http://s186.photobucket.com/user/Viperracinguk/media/FattyPipes_zps6505cc5e.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/FattyPipes_zps6505cc5e.jpg[/img][/URL]

Makes our CR250 fatty pipe look like it's been to weightwatchers :o

Best Regards

Ian :)

Hi Allan

Hope to be on You Tube within 48 hrs.

Ian :)

Hi Guys

First ever track outing for the Viper SK250S at Silverstone with driver Mark Stansfield.
[URL=http://s186.photobucket.com/user/Viperracinguk/media/StannySstone1_zps5f274372.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/StannySstone1_zps5f274372.jpg[/img][/URL]
Next outing Oulton Park, Cheshire, UK March 27/28th. MSA British Superkart Championship

Best Regards

Ian :)

Hi Allan

All is going well, but it takes forever, having to keep existing customers happy as well. We have been and always are exceptionally busy leading up to this time of year.

Apologies to our very understanding customers for any delayed orders. I believe that we ship out our 2 (well one and a half!!)outstanding Aus orders on Tuesday of next week. One is ready to go and the other will be finished tomorrow.

We are currently testing with our first production cylinders. Previously we have been using 3D Laser Sintered (DMSL) prototypes. This first customer batch of 10 will be all hand finished to whatever spec we find is best and we have another 5 on which we will do all the testing and run on the dyno/track for our team motors.

We are also maximising on pipe design, carburation, ignition and combustion vol/squish. As you well know everything is interlinked, so we start with "scatter testing" and gradually focus in and optimise. As you can image this is hundreds of options and dyno runs, but I'd say we are about 90% right-now.

Our first full production batch of pistons should be with us prior to our next track outing at Cadwell Park on the 18th May, but if not prior to the 2nd round of the National champs at Silverstone 2 weeks later.

So all things being well customer engines will be released for shipment by the end of May. I believe it's silly to rush, rather than give the customer a well finished, reliable and tested product, that we fully understand. After all, it is our reputation on-the-line.

I know everyone waits not only to see track performance, but dyno figures. As soon as I think it pertinent (say when we hit 95% of our accepted SIM or exceed our Hondas by 5% on realistic race settings), I'll release some graphs. What I will say is that everything is looking absolutely fantastic. We of course expected some teething problems, but so far have exceeded all expectation.

Best Regards

Ian :)

[URL=http://s186.photobucket.com/user/Viperracinguk/media/Scotts_zps66575b9c.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/Scotts_zps66575b9c.jpg[/img][/URL]

Ready to pack and ship on Tuesday after the Holidays. Half an order!!

Best Regards

Ian :)