<!--quoteo(post=40472:date=Sun 13th May 2007, 11:07 AM:name=jht)-->QUOTE(jht @ Sun 13th May 2007, 11:07 AM) <{POST_SNAPBACK}><!--quotec-->Toying with jet sizes and came across this, posted several times on a few websites, anyone came across this before?
Gonna call PDQ to get their take on it in the week
http://faq.f650.com/FAQs/JetKitFAQ.htm
http://www.ds650.net/mikunivsdynojet.htm
http://www.angelfire.com/pa5/cannondale/Mi...vs.dynojet.html
Ever wonder why mikuni and Dynojet Jets have different numbers for the same amount of flow? If yes, then read on to find out why.
Mikuni Dynojet - Main Fuel, Primary and Secondary Pilot Air Jets
Flow rates based on size markings of Mikuni and DynoJet jets are not comparable. As a guide the chart to the left indicates equivalent sizes based on the diameter of hole in the jet.
Mikuni jets are chamfered on the inside opening at the threaded end and Dynojets have a machined flat surface. Keep this in mind when using this chart. These physical differences will never allow an exact comparison.
This chart is intended to be used as a tool to assist you in making a more accurate decision when selecting a jet size range or comparing tuning data where an opposing brand is being used.
Actual jet sizes are highlighted.
DynoJet jets are marked according to the diameter of the hole in the jet .. ie: DJ150 = 1.5mm and DJ175 = 1.75mm.
This is not true for Mikuni or most other OEM equivalent jets. This size Mikuni jet, (N102.221 Super BN), is marked according to its' flow rate, ie: 150 = a rating of 150 cc of fuel per minute.
--------------------------------------------------------------------------------
Mikuni Dynojet
140 149.3
150
142.5 152.0
145 154.7
155
147.5 157.3
150 160
152.5 162.7
165
155 165.3
157.5 168.0
170
160 170.7
162.5 173.3
175
165 176.0
167.5 178.7
180
170 181.3
172.5 184.0
185
175 186.7
177.5 189.3
190
180 192.0
182.5 194.7
195
185 197.3
187.5 200
190 202.7
(copy + pasted info, tried to seperate table above so easier to read, but in aint working..)<!--QuoteEnd--><!--QuoteEEnd-->
not strictly true
there are two types of mikuni jets - hex head and screwdriver slot
the ones with a screwdriver slot are numbered in the dia of the hole, the hex main jets are flow rate.
It has been proven on Thmpetalk that Mikuni and DJ jets are the same.
Do not believe what DJ tell you - they are in the market to make money from selling their jets.
Gonna call PDQ to get their take on it in the week
http://faq.f650.com/FAQs/JetKitFAQ.htm
http://www.ds650.net/mikunivsdynojet.htm
http://www.angelfire.com/pa5/cannondale/Mi...vs.dynojet.html
Ever wonder why mikuni and Dynojet Jets have different numbers for the same amount of flow? If yes, then read on to find out why.
Mikuni Dynojet - Main Fuel, Primary and Secondary Pilot Air Jets
Flow rates based on size markings of Mikuni and DynoJet jets are not comparable. As a guide the chart to the left indicates equivalent sizes based on the diameter of hole in the jet.
Mikuni jets are chamfered on the inside opening at the threaded end and Dynojets have a machined flat surface. Keep this in mind when using this chart. These physical differences will never allow an exact comparison.
This chart is intended to be used as a tool to assist you in making a more accurate decision when selecting a jet size range or comparing tuning data where an opposing brand is being used.
Actual jet sizes are highlighted.
DynoJet jets are marked according to the diameter of the hole in the jet .. ie: DJ150 = 1.5mm and DJ175 = 1.75mm.
This is not true for Mikuni or most other OEM equivalent jets. This size Mikuni jet, (N102.221 Super BN), is marked according to its' flow rate, ie: 150 = a rating of 150 cc of fuel per minute.
--------------------------------------------------------------------------------
Mikuni Dynojet
140 149.3
150
142.5 152.0
145 154.7
155
147.5 157.3
150 160
152.5 162.7
165
155 165.3
157.5 168.0
170
160 170.7
162.5 173.3
175
165 176.0
167.5 178.7
180
170 181.3
172.5 184.0
185
175 186.7
177.5 189.3
190
180 192.0
182.5 194.7
195
185 197.3
187.5 200
190 202.7
(copy + pasted info, tried to seperate table above so easier to read, but in aint working..)<!--QuoteEnd--><!--QuoteEEnd-->
not strictly true
there are two types of mikuni jets - hex head and screwdriver slot
the ones with a screwdriver slot are numbered in the dia of the hole, the hex main jets are flow rate.
It has been proven on Thmpetalk that Mikuni and DJ jets are the same.
Do not believe what DJ tell you - they are in the market to make money from selling their jets.