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Davy123
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Date Posted:02/18/2011 7:05 PMCopy HTML

Ex_Member #1
  • Rank:
  • Posts:0
  • From:Unknown

Re:2011 season bike

Date Posted:02/18/2011 9:43 PMCopy HTML

sweet bike Davy,
Give us the details
Davy123 #2
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:2011 season bike

Date Posted:02/19/2011 10:37 AMCopy HTML

The frame is from an Italian TGM which i converted to accept the honda engine,maico fork and yokes,works shocks,acerbis tank and elsinore side panels..

Engine is a sideport 250 bored to 298cc with a carillo rod,38mm mikuni , 45mm exhaust.
The cylinder head has been converted from sideport to centreport with combustion chamber severley altered, 38mm inlet port and exhaust around 42mm,the valves are stainless  35mm and 30mm ,cronical valve springs with ti tops all from jawa speedway engine, the cam is a needle roller item but very different from the normal as the rockers have been converted to rollers, the ignition wll be electronic i have been experimenting with various ..but for now i'll use points to get the carb dialed in...
 
1oldgoat #3
  • Rank:Gold Member
  • Posts:141
  • From:USA

Re:2011 season bike

Date Posted:02/19/2011 9:56 PMCopy HTML

Davey,

What a nice bike! With your build you are a perfect example of what I grew up around in the early to mid seventies in the off road/mx scene, and feel what is missing in today's world of off roading! Something you can be very proud of!

By the way what class to you compete in with the cc displacement? Also you mention roller rockers, they don't happen to be similar to what is posted on the XL Page? If so a few pictures and engine details would be great to drool, eh, I mean read over! 35mm intake and 30mm exhaust valves with a 38 mikuni! WOW!!! What rpm's is the thing capable of and how is the power delivery? It must be quite a ride!

Once again thank you for the post and inspiration!

David
Davy123 #4
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:2011 season bike

Date Posted:02/19/2011 10:34 PMCopy HTML

cheers...Bike will compete in the pre 75 vintage motocross class up to 300cc...pics speak a thousand words..
Davy123 #5
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:2011 season bike

Date Posted:02/19/2011 10:49 PMCopy HTML

I aint had it running yet just waiting on the final few parts..as for revs with points maybe 10k before they bounce , electronic 12k plus?   at a guess...power delivery will be 'interesting' i would imagine especially with the cam i'm using....

woosh #6
  • Rank:Diamond Member
  • Posts:1568
  • From:Unknown

Re:2011 season bike

Date Posted:02/19/2011 10:51 PMCopy HTML

Did they custom make the rockers for you and was the carillo rod installed on the xl crank?
Davy123 #7
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:2011 season bike

Date Posted:02/20/2011 10:33 AMCopy HTML

woosh...I bought a crate of xl engine bits and the roller rockers and head were amongst it...it is the very one posted in the archive section on this site..there was also two cranks with carillo rods ...
I belive they were used in a grasstrack bike ,the intake manifold is from a jawa grasstrack/speedway engine ,someone has spend a lot of time and money doing the head work ...
Davy123 #8
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:2011 season bike

Date Posted:10/15/2011 9:45 AMCopy HTML

first outing ..



Go soothingly on the grease mud ... as there lies the skid demon! ...





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