Author Topic: 250 four stroke breaks 130 mph  (Read 12887 times)

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Offline dr j

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  • Honda CRF250 & RS125 & 1954 Moto Parilla 175
Re: 250 four stroke breaks 130 mph
« Reply #30 on: March 18, 2012, 06:19:27 PM »
Tiny,
  I know my single cylinder CRF250R engine sounded nothing like that.  It was just a thump, thump, thump. 
 Bummer you couldn't give it a run.  When is your next target?
   
Doc J, thanks for your interest.
My "other" bike thumps also.

Then purrs
http://www.youtube.com/watch?v=Uh6mtzR9Yr4&feature=channel
There is a LOT of work involved in setting another date for the DLRA event, there's a salt inspection happening now, and rumours of a possible  date sometime in May, or late Sept ?
My initial goal with the 250 is to better the "other" cbr250 record of 121.777 (MPSG-250), although I'll be in ABF-250, I'd feel a bit stupid if I can't do 125, but,,,lol

One day I'll get the 175 up to the "ton", but I'll need to finish the fairing 1st.
Nice sounding 175 on that youtube link.  Is that an XL175 engine?  Then in the photo did you make it a DOHC?

As for your 250cc goal in A/B/F of 125mph sounds very do-able.  Judging by the pictures your fabricating skills far exceed mine.  Can I assume you will first try without NOS to be sure the supercharger is working the way you planned?  Is the CBR record you quoted of 121mph the fastest 250cc 4stroke record in DLRA books?
Jarl- Moto Madcap
Sharpsburg MD
BUB2012- Morini 350- 4 Mod Pushrod records, Parilla 175- M-VG rec
250cc 4stroke Nitrous Motorcycle- 131.8mph
250/4 Naked Motorcycle-115.6mph
APS/F-125/2 115.2mph
P/PV-175/4 Moto Parilla-59.7mph
29 Retired Maxton Class Records on 3 bikes and 4 engines

Offline generatorshovel

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    • http://www.dlra.org.au/forum/viewtopic.php?t=556
Re: 250 four stroke breaks 130 mph
« Reply #31 on: March 18, 2012, 06:41:11 PM »
Doc J, I have no Nos plans, but have the option to up the boost from 8 psi, to 10.5psi, with a bottle of nitro on hand if I get that desperate to blow it up.
The 175 is a complete hybrid,,all is revealed here,,
http://www.dlra.org.au/forum/viewtopic.php?f=18&t=556
The DLRA does not seperate 2 & 4 stroke, and the CBR 121 isn't a record,(I don't think?),just the fastest cbr250 (my personal target)
Tiny (in OZ)
I would prefer to make horsepower, rather than buy, or hya it, regardless of the difficulties involved , as it would then be MINE