Had a discussion with a number of Bultaco experts some time ago about possible shades of Bultaco blue. It ended "there is only one known Bultaco blue from factory". Different shades of blue seen on old colour photos is possibly due to agening photos. This is good for me unless someone has different and more correct information.
Agree👍 They are surprisingly durable. A replacement is not the first thing I would look for. Go for the Domino and as said previously, do not overtighten the bolts.
199A head steady is not a good design. Mine has been broken for at least one year now. Seems to work well nevertheless. Best is of course to loosen all necessary bolts and retighten to avoid extra strain after assembly. For my 199B I have made a new and better design but not tested yet.
It might be residues from air filter spray that follows the airstream into idle system and get stuck. It is not dissolved in clean petrol. Some people use Carb-Cleaner to dissolve. Have no experience of that liquid. When blowing, should use well filtrated HP-air. The passages are very small in the idling system so it can be difficult to clean. It happens it is a nightmare. Perhaps you should concentrate on cleaning the carb body and buy a new jet.
As jets can be dirty from factory it is best to have it ultrasonic cleaned before assembly. For safety´s sake, HP-blow the jet after the Ultrasonic cleaning.
Is it a Dellorto VHST or Kehin PWK?
My last carb-cleaning-nightmare was approx 8-10 years ago with a Mikuni (original) on a Beta evo 4t. Eventually a man (not me) fixed it.
To me it sounds like you have a problem with dirt in idling system. Not easy to clean. Must take everything out from carb and carefully blow and clean. Remember to blow and clean all drillings and passages in carb body. After only use a good, clean and oiled airfilter and change often. As I see it, dirt in idling system is one of the most common problem in a dirt bike. If problem is only at certain throttle openings I would say it isn´t the ignition. Ignition problems is most often at all throttle settings.
Accordingly to this list https://cemoto.tripod.com/list.html 199B started in May 1981 and ended ? Numbers should be 12876-14653. It is unclear when production ceased. Some sourses say in 1983. Rumours say the workforce assembled the last bikes from remaining parts
The pressure in in the lower leg on a normal fork so the seal should seal downwards. Looks to be OK in the first photo. I recommend SKF (original at newer evo) fork seals. To protect the seal from damage (easy to do) cover the all sharp edges with some electrical tape and grease or oil the stanchion and tape before assembly. The guy in the movie clip seems to do it correctly
I think the Mikuni VM was quite good for my 199A. However, might need some fine tuning, and adjustments to float level, as I always had problem with sudden engine stops when going slightly downhill. The sound indicates too rich mixture at low throttle setting, but runs well. And the Air Screw is on the right side😕
OKO (mid-atlantics) sounds good and runs good. I found the airfilter (inside air box) and connection to carb to be important. I use OSSA tr80 airfilter and a small platic tube inside the air box rubber as a connector to get it all working.
The OKO has idle and air screw to the left
Let´s see later next year if I still prefer the OKO
If you test, pay attention the OKO is flat slide. Make sure it is permitted if you want to compete.
Tried different PHBL combinations. This is one of the latest
Idle 25
Needle 266K
Needle jet D36
Throttle 60
Main 115
Thought first it was very nice. Strong mid throttle and full throttle
Later found out it was little weak at low throttle.
Perhaps PHBH is more all round. Also more period.
OKO or Mikuni for Bultaco is more all round. Today OKO is my first choice. However OKO may not be permitted for competition everywhere. But flat slide is period
As Sherpa325 says you must find out "what is wrong with what" before trying to rectify it.
If you suspect the Dellorto, test OKO. Pay attention to the air filter and how the carb is connected to the air box. I found out this is very important
I think you have a fuel delivery problem.... somewhere..... perhaps inside carb, but always good to replace the spark plug after long standstill. Use plug accordingly to manual. Nothing else.
Bultaco 199A & B Colour Codes
in Bultaco
Posted · Edited by carl ekblom
Had a discussion with a number of Bultaco experts some time ago about possible shades of Bultaco blue. It ended "there is only one known Bultaco blue from factory". Different shades of blue seen on old colour photos is possibly due to agening photos. This is good for me unless someone has different and more correct information.
My remark is RAL5015 suits well (or perfect) and it´s easy to find https://www.ctborracha.com/wp-content/uploads/2019/02/3-RAL-to-Pantone-Conversion.pdf