After over a year, have finally finished my total rebuild of a 70 H1. Crank, new 61.5 Wossners, Lakeland CDI, vapour blasting of engine n carbs, tank n frame painted, gearbox shimmed and reconditioned, KnN air filter, etc etc etc. Started on the 5th kick and ran great, took her for her maiden run and she went awesomely in the mid revs and once I let her have some head she wanted to take off over the 6000 rpm but pulled her back as new pistons etc.
Trouble is, it wasn't good at all in the lower revs and idle to a point it bogged down and stopped. Obviously very rich, I suspected pilot jets, screwed them out to 2 turns and even lowered the jet needles one but to bugga all effect. The carbs are stock standard and checked it has the correct Mikuni jets. Cleaned them many times air holes n all. On the 3rd removal of the carbs, double checked the float bowl heights, (in a bowl with fuel bowl off and also measuring float heights @ 25mm) id decided to measure the ID of the needle jets and bingo, stuffed, tapered to hell and can put 2.8mm into the top part of the jet, (compared to the needle jet from my in bits H1B). Book says the ID is 2.610mm 194 series 0-2 (16017-029) and I think the H1B, 0-4 is 2.620mm
Question
1 can any one give some advice to where one might get some of these jets as they seem to be rare as hens teeth,
2 I can get hold of NOS 194 series 0-4 (16017-058) guessing for later models. Can I use these in the interim and if so, do I need to change the jet needles as well?
Cheers Bill
ps I searched many of an hour here for info in this forum and helped big time to go thru the tuning saga. Many thanks
What a transformation, put the needle jets (0-4 instead of the 0-2) from my spare parts bin from a H1B after testing them with a 2.6mm drill end. Man what a journey this has been getting her running, bloody nearly gave a up a few times, thanks to this forum, the comments and a wife's support. At least I can now get her registered and warrant of fitness for the road and start running her in. Still some tuning to do tho, have ordered some 5DJ19 jet needles to suit the H1B needle jets. One for the books indeed.