i built a crank case inducted blaster..

[twinrock]

I started a thread about the possibilities of a crank case inducted blaster using a dt200r motor, basically tye same as a wr200.. i had no response or input. But i went ahead and built it using a vito big bore top end . Basically i cut off the blaster intake and filled it with liquid metal , i also cut the sleeve skirt to match the crank case intake..i has to trim the fins slightly to get it into the bike..i also "o" ringed the cylinder in place of copper head gasket . I also cleaned up all the ports and flowed tye transfers.. im running a 30mm lectron carb and fmf pipe ...
It has transformed the bike..firstly much louder..and more vides..anyone who has ridden a dt200r..will know they a a butter smooth very linear power delivery..it has be come a very agressive lil power house. It has surpassed expectations im very happy with it cant wait to get it dirty..

 

[Awk08]

Sounds like an interesting build, get any pics during the modifications ?
Pics of finished product ?

 

[Tooloose]

Tooloose likes this!

 

[Tooloose]

I'd like to build a 250r engine and fit it to a blaster chassis! I worked a banshee once that they had adapted a cr-500 to its frame and it was absolutely dangerously fast. 0- crazy in three seconds or less

 

[twinrock]

Her are some pics

 

[twinrock]

And another

 

[twinrock]

Bike

 

[best]

SWEET! Unfortunately we didn't get the WR200 engine here in Canada.
I don't think they got it in the USA either.

 

[Awk08]

Bike

that's wild how you blocked off the stock cylinder, and looks dangerous that you put it in that bike

 

[twinrock]

At bike has gone a few transformations..including a motard set up using a complete rear end off a yamaha fzr250 and a fzr front wheel in stock forks.. but i have put the dirt wheels and suspension back on as its much more fun off road..the bike is just on 100kg and makes more power than the dt200r i had running in it before..there is no shortage of dt200r here in australia..plus every other road going 2 stroke ever made.. i have a very nice rz350 as well

 

[Larry's Shee]

Is the advantages of a case reed worth the work?
Don't recall if it's the DT line or not, but OZ (and a few other places) got dt220 and dt 230's

 

[twinrock]

Yeah..we got dt230 but they are no where near as common and much more expensive.2 -3 times what u can buy a dt200r for.. i had looked for a cheapish one for ages. They are a lil more complicated too electric start traction control and a nikasil bore, which is a big hassle here as if something happens to the bore its very expensive to replate. They are heavy too steal swing arm etc.they also share very lil with the dt or blaster ,there are far getter bikes to buy for the money.
As for the project..it was about utilising the vast aray of blaster parts available and making a really simple but smooth and hopefully powerfull fun engine..and bike
As for the advantage of crank case..well i would have to ride a standard set up blaster to compare..but as it sits now it goes great. I guess for you guys you could get a wr200 bottom end and in one evening fit a stock blaster top end and compare..u dont have to touch the bottom end at all..and blaster top end could be returned to the original state with a bit of work.

Its much easier to work on and there are less things to go wrong its lost a bit of weight too.. it does not have the instant bottom end response of the dt, or the incredible smooth running and smooth power delivery..but it has a killer midrange and more power ...ill be riding next week with a buddy with a stock dt200r it will be interesting to see how mine now differs...
As for effort..it was moreof an effort just to fit it in the bike..fitting the top end on the motor was simple

 

[Devo]

Sweet build brudda.. amazing fabrication.

 

[best]

Is the advantages of a case reed worth the work?
Don't recall if it's the DT line or not, but OZ (and a few other places) got dt220 and dt 230's

Case induction has no interference with the flow from the carb, the piston does not get in the way and the piston does not need windows in it. All the MX engines since 1982 have been case induction.

 

[twinrock]

Well now for the verdict..
I spent the last week in on the bike the riding was a good combination mostly tight technical first gear stuff along with some slippery hill climbing and a bit of open plain stuff..but still barely enough room to wind out 3rd gear. And all next to a buddy on a pretty much stock dt200r
The bigbore blaster makes great midrange and almost unusable top end power with a lightswitch power band.which made it harder to negotiate the tight stuff good clutch and throttle control was needed..and it was not long till my throttle hand was cramping a lil. But once off throttle and into power it was smooth and plenty

...getting off the blaster and onto thedt200r the first thing instantly noticed was the extra top heavy weight of the dt200r ..due to radiater shrouds and proctecting frames....however the farmiliar unbelievable almost turbine smooth reving engine made u forget about radiators.. no need to up the revs to pull away like the blaster, the dt pulls instantly away with instant effortless bottom end power with a lineal progression to midrange allowing the bike to hook up easily keeping the rear wheel in traction..make no mistake the dt makes instant usable fast power, thanks to power valves, as i already knew..power did seem to fall off in the top though..and was 3 teeth bigger on the rear than my bike..slow crawling was a breeze..and generally easier to ride..so next was a drag race this was to be done on a sealed road to take any issue of traction loss out of it..however..i have been riding most of my life and my mates are pretty new so i killed them on the starts..we had a roll on race and i let him get a jump..the blaster soon had him square then pull away..but not by much..so in conclusion..the biggest difference is not water cooling..its power valves..top end power and sideways whheel standing action goes to the blaster.. absolute smooth instant power delivery from anything over idle goes to the dt200r..

 

[blast_biker]

Case induction has no interference with the flow from the carb, the piston does not get in the way and the piston does not need windows in it. All the MX engines since 1982 have been case induction.

All MX engines since 1982 have been case induction? You sure about this?
2018 YZ250 is not. (https://www.yamahamotorsports.com/motocross/models/yz250)
2008 RM250 is not (http://www.vitalmx.com/community/Cooper-688,45015/setup,49805)
2005 KX250 is not (http://www.motorcycledaily.com/2004/06/18june04_2005kawasaki_kxs/)
A CR and KTM are the only one from the major manufactors (http://motocrossactionmag.com/bike-test-we-ride-the-ultimate-honda-cr250-two-stroke/)

If talking about quads, TRX or Tecate weren't case induction, and the LT250R went away from case induction.

 

[best]

All MX engines since 1982 have been case induction? You sure about this?
2018 YZ250 is not. (https://www.yamahamotorsports.com/motocross/models/yz250)
2008 RM250 is not (http://www.vitalmx.com/community/Cooper-688,45015/setup,49805)
2005 KX250 is not (http://www.motorcycledaily.com/2004/06/18june04_2005kawasaki_kxs/)
A CR and KTM are the only one from the major manufactors (http://motocrossactionmag.com/bike-test-we-ride-the-ultimate-honda-cr250-two-stroke/)

If talking about quads, TRX or Tecate weren't case induction, and the LT250R went away from case induction.

Yup, even though the carb is attached to the cylinder, the passage is completely bypassing the cylinder bore and going directly into the crankcase.

 

[twinrock]

Ill also add that the air cooled top end came into its own when my mate opened it up and caught him of guard ..he frantically hit tge brakes low siding the bike at considerable speed..he was ok and so was the bike..but radiators would have taken a direct blow if they were still there..the thing that slows the bike down most is suspension

 

[twinrock]

Now what about adding a power valve..?? ..u could put it into the exhaust like the yamaha EXUP system in the yzf 4 stroke road bikes....pretty easy to do..