reghusky Posted yesterday at 11:58 AM Report Share Posted yesterday at 11:58 AM Hello, I wonder if anyone can help please? My son has a rev 3 125 2006 with the dellorto VHST 26 carb. I have taken the carb out to clean it and check jets, it has a threaded hole here which leads straight into the carb bore, should this be blanked off? I can't believe it's right to let unfiltered air straight into the engine?! Also does anyone know the standard jets/needle position for the dellorto? Thank you. Quote Link to comment Share on other sites More sharing options...
konrad Posted yesterday at 01:18 PM Report Share Posted yesterday at 01:18 PM I'm used to the PHBL, but your VHST looks like this photo: https://www.speed-parts.nl/carburateur-dellorto-vhst-26-mm-bd-flat-slide.html The casting probably was made that way so it could have mixture and idle screws on either side. You could test with compressed air. Quote Link to comment Share on other sites More sharing options...
reghusky Posted yesterday at 02:20 PM Author Report Share Posted yesterday at 02:20 PM Yes, I agree it looks like the casting is made for both. It definitely goes from outside to inside, I thought the unused side would be blocked or capped. I wondered if anyone had the 125 and could confirm or deny? Quote Link to comment Share on other sites More sharing options...
konrad Posted 19 hours ago Report Share Posted 19 hours ago 5 hours ago, reghusky said: I thought the unused side would be blocked or capped. Typically, the unused side would not have been machined. If it was like that from Day-1, the engine would have had a massive air leak and never worked properly. Quote Link to comment Share on other sites More sharing options...
reghusky Posted 8 hours ago Author Report Share Posted 8 hours ago Yep, that's what I think Konrad, I wonder if it was meant to have a blanking plug in it which has fell out. It was running but idle was erratic. Piston, rings and crank seals have all been done. Quote Link to comment Share on other sites More sharing options...
konrad Posted 4 hours ago Report Share Posted 4 hours ago I don't see that you have anything to lose by plugging a hole that should not exist. Personally, I would try something quick and dirty like hot-melt glue. If that was successful, I'd use epoxy. Quote Link to comment Share on other sites More sharing options...
reghusky Posted 1 hour ago Author Report Share Posted 1 hour ago That's a good idea, I was wondering what to plug the hole with! Cheers. Quote Link to comment Share on other sites More sharing options...
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