More carb rubber questions.

[sgm]

Hi Guys, I've been looking on the forum for a defiitive answer to this but not found it so sorry if it's been asked and answered before. My bike is an Inazuma 750 with a bandit 1200 MK1 lump fitted with a DOT head and cams,Carbs and inlet rubbers  are also 1200 MK1 but there's quite a big step from the rubbers to the inlet port and wondered if that would affect performance and if so what inlet rubbers should I use ?  Thanks to all replies, Stevie. 

[Upshotknothole]

DOT head wants DOT rubbers, and Mikuni RS flatslides are a perfect fit in those rubbers, otherwise stock carbs for the 88/89 GSXR 750 were 36mm CVs. You'll get more power with a smooth transition between intakes and head. Unfortunately those 88/89 GSXR 750 intakes have been discontinued for awhile now and you'll be looking for a decent set of used ones that aren't rock hard. How bad is the fit? Post up some pics.

[sgm]

OK thanks for that. I did look for DOT rubbers and as you say they're hard to come by, not found any yet. There must be at least 5mm or more of a lip. I'll post some pics up later.  I've had  a lot of problems with this build other than carb issues so just trying to get it on the road for now, just one thing after another, small fortune already put into it but hopefully this is the last hurdle I've got to get over. Was thinking of getting a set and turning them out with a flappy wheel on my bench drill. There are plenty of new rubbers on Eblag but god knows which ones to get and would I have to take so much off them they'd be wafer thin ??  who knows !! 

[Upshotknothole]

The Eblag intakes that say they fit, don't. Don't waste your time or money with them.

[sgm]

OK thanks, is the type 17C I need

[clivegto]

Just smooth the step out between the rubbers and the head. 

[fatblokeonbandit]

First bandit engine i did was B12 with DOT head and cams, years ago, i didnt know anything then, still dont know much,  and just slapped it all together, it went fine, later i had it to bits and did notice a step, so used a dremmel with drum sander to make it a bit better, but it went so much better than a standard B12 i was well happy with it.

cobble it together and give it a good thrashing

[DAZ]

2 hours ago, fatblokeonbandit said:

First bandit engine i did was B12 with DOT head and cams, years ago, i didnt know anything then, still dont know much,  and just slapped it all together, it went fine, later i had it to bits and did notice a step, so used a dremmel with drum sander to make it a bit better, but it went so much better than a standard B12 i was well happy with it.

cobble it together and give it a good thrashing

I remember that, I was impressed because I seem to remember it made 130 or 135 horses with basically a head and cam swap 

[fatblokeonbandit]

yes it was somthing like that, i keep meaning to write all this stuff down, but its too late now as i cant remember my name is dave some days!!

If I remember corrctly, on the same dyno back in 1997/8 ish my 1200 made 98 HP bog standard, with Dot head cams a race can and filter 118hp and with the head and jet kit as well 130 ish?? I think, ??

[Joseph]

On 5/17/2024 at 12:30 PM, fatblokeonbandit said:

yes it was somthing like that, i keep meaning to write all this stuff down, but its too late now as i cant remember my name is dave some days!!

If I remember corrctly, on the same dyno back in 1997/8 ish my 1200 made 98 HP bog standard, with Dot head cams a race can and filter 118hp and with the head and jet kit as well 130 ish?? I think, ??

On here some time ago you mentioned :

(RWHP)

Stock : 98

Sport can, KN, dyno kit : 107

Above with 750 '89 cams : 118

Above with DOT head and full akra : 133

 

[sgm]

Thanks for all the replies guys, managed to get a set of the correct inlet rubbers so gonna fit them over the weekend, sadly don't have a Dyno rolling road up here but next time I'm on the mainland I'll look up where is closest to me. Would love to see what BHP it makes, thanks again lads, appreciated. 

[sgm]

Hey guys, so got the inlet rubbers fitted now and definitely better,  It was a bit lumpy round town so lifted the needles one notch, took it for a run and was great until it warmed up proper then started to get a bit lumpy again in town, going to turn the mixture screws out 1/4 turn at a time and see how that goes. It's nearly there though, takes off like a stabbed rat further up the rev range. Will let you know how i get on. 

[sgm]

2 hours ago, sgm said:

Hey guys, so got the inlet rubbers fitted now and definitely better,  It was a bit lumpy round town so lifted the needles one notch, took it for a run and was great until it warmed up proper then started to get a bit lumpy again in town, going to turn the mixture screws out 1/4 turn at a time and see how that goes. It's nearly there though, takes off like a stabbed rat further up the rev range. Will let you know how i get on. 

Or maybe turn them in a tad I've being advised.