Page 1 of 1
Ivan carb kit
Posted: Tue Feb 24, 2026 11:16 pm
by Bungditin
So I’ve been trying to buy said carb kit from supplier.
He’s still looking for a reputable machinist, his words, not mine.
So no kits are available yet.
Re: Ivan carb kit
Posted: Wed Feb 25, 2026 11:26 am
by skub
Weren't they in the process of moving premises and this has disrupted things?
Re: Ivan carb kit
Posted: Wed Feb 25, 2026 9:20 pm
by Nigel Thorpe
Yes Ivan was moving, but according to him over the phone, one of the main problems is that the company/guy who used to make his parts decided to retire. Ivan did say that he wanted to continue doing the kits - can't wait. I'm after 2 of them.
Re: Ivan carb kit
Posted: Thu Feb 26, 2026 6:13 pm
by Nigel Thorpe
Has anyone contacted Ivan recently? Back in September time he suggested contacting again in March this year.
Re: Ivan carb kit
Posted: Thu Feb 26, 2026 8:00 pm
by Triple Parts
Are they really worth it? For every person who raves about them, I hear another person who says they didn't work
You may find this thread useful...
viewtopic.php?p=154685#p154685
Re: Ivan carb kit
Posted: Thu Feb 26, 2026 10:47 pm
by Zytec
If I recall wasn`t there issues surrounding Ivan`s carb kits quite a while back and the consensus among members was that Motocarb were the only reliable source for quality carb kits ?
Re: Ivan carb kit
Posted: Sat Feb 28, 2026 11:00 am
by Tilly H2C
Zytec wrote: ↑Thu Feb 26, 2026 10:47 pm
If I recall wasn`t there issues surrounding Ivan`s carb kits quite a while back and the consensus among members was that Motocarb were the only reliable source for quality carb kits ?
Ivan 'carb kit' is a selection of std Mikuni main and pilot jets plus Ivans own jet needle design, it's really only the needle that is different (although he includes a new needle jet that I believe he also makes but is std size) the jet needle has multiple different tapers along it's length v the std needle (5EJ15 or 5FL14) which I believe have only one taper angle.
Motocarb mostly only supplies std Mikuni parts but with a wealth of knowledge from Steve, there are very few std Mikuni (Kawasaki) needles available these days.
Even with an Ivans kit fitted your bike can still run like an absolute pig if not set up correctly, as an eg I rode a H2c with an Ivans kit and zero surging (said the owner) he was correct, no surging at all but also a bike that was that rich it 4 stroked until it got past 60 mph in the higher gears, I imagine he had a good supply of new spark plugs handy.
The best I can get my bike to run is with either the Ivans needle, the 5FL14 or the 5EJ15 needle and once set correctly they are all very similar in riding experience but not perfect, by that I mean I can cruise at any speed and rpm with no surging at all, the difference comes when I close the throttle very slowly and how far it can be closed before the surging chaos starts,
If I can slowly close the throttle by about 3/4 of how far I have it open and completely close it with no surging that's about as good as it gets with just that little bit of 'no go' throttle opening that can be easily avoided.
Of course the following day depending on our UK weather could be a whole different experience
Re: Ivan carb kit
Posted: Sat Feb 28, 2026 11:20 am
by Zytec
Tilly H2C wrote: ↑Sat Feb 28, 2026 11:00 am
Zytec wrote: ↑Thu Feb 26, 2026 10:47 pm
If I recall wasn`t there issues surrounding Ivan`s carb kits quite a while back and the consensus among members was that Motocarb were the only reliable source for quality carb kits ?
Ivan 'carb kit' is a selection of std Mikuni main and pilot jets plus Ivans own jet needle design, it's really only the needle that is different (although he includes a new needle jet that I believe he also makes but is std size) the jet needle has multiple different tapers along it's length v the std needle (5EJ15 or 5FL14) which I believe have only one taper angle.
Motocarb mostly only supplies std Mikuni parts but with a wealth of knowledge from Steve, there are very few std Mikuni (Kawasaki) needles available these days.
Even with an Ivans kit fitted your bike can still run like an absolute pig if not set up correctly, as an eg I rode a H2c with an Ivans kit and zero surging (said the owner) he was correct, no surging at all but also a bike that was that rich it 4 stroked until it got past 60 mph in the higher gears, I imagine he had a good supply of new spark plugs handy.
The best I can get my bike to run is with either the Ivans needle, the 5FL14 or the 5EJ15 needle and once set correctly they are all very similar in riding experience but not perfect, by that I mean I can cruise at any speed and rpm with no surging at all, the difference comes when I close the throttle very slowly and how far it can be closed before the surging chaos starts,
If I can slowly close the throttle by about 3/4 of how far I have it open and completely close it with no surging that's about as good as it gets with just that little bit of 'no go' throttle opening that can be easily avoided.
Of course the following day depending on our UK weather could be a whole different experience
Interesting and thanks for the reply.
Re: Ivan carb kit
Posted: Tue Mar 03, 2026 7:49 pm
by Doctorpayday
Hi
When I had a h2, I wasn't happy with the surging and went to great lengths to lessen the effects, as detailed within the forum pages.
Eventually settled for an ivans kit, which changed the characteristics and eliminated the surging. It performed similarly to a gt750 but I missed the hooligan element.
Doc