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Post by primrose on Sept 29, 2019 18:16:56 GMT 1
Just got my 421 engine back from the builder. I have Lomas pipes for it and obviously they don't fit . i know there is a adapter for these, does anyone know who sells them? While I am here, I take it that with the oko 34mm carbs I have I will need to change the fuel tap for a non vacuum tap and run it on premix? Would it be better , and much easier to get some mikuni's for it? . Sorry for all the questions , but in a bit over my head with this.
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Post by markhoopy on Sept 29, 2019 19:31:33 GMT 1
You don't have to run premix - the carbs can be drilled to accept an oil feed union, and Arrow is the man to ask about modifying your existing pump to give the correct flow to suit the bigger engine.
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Post by midlifecrisisrd on Sept 29, 2019 19:53:18 GMT 1
As Mark says they should be drillable for spigots
Also I have fitted a scottoiler universal bolt through spigot to a carb rubber to supply the vac fuel tap
Think TSA Kenny made adaptors for headcoats to fit lomas pipes
Steve
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Post by headcoats on Sept 29, 2019 20:04:53 GMT 1
Yes Kenny made me some adaptors
They will move the rear mounts a bit , so a bit of adapting will be needed
Have a look on my thread build but they do look OK on the bike
You will need big fook off springs too but TZ ones are long enough :-) |
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Post by muttsnuts on Oct 2, 2019 20:40:05 GMT 1
which 421 is it, the reason I ask is because the Lomas pipes if for a 350 won't work at all if your 421 is a Cheetah cub, serval or Assassin build, the exhausts need to be a completely different design
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Post by muttsnuts on Oct 2, 2019 20:44:09 GMT 1
PS - I have adapters to fit the Athena, cheetah cub, serval, assassin barrels spigot, but they are weld on, not a slip on for your original fixings to fasten to, bear in mind that if you "add" extra length to your exhsust at the header you are changing the tuned length of the pipe and also the characteristics of the pipe, although it sounds like the pipes you are intending using aren't made for a 421 specially anyway, so unlikely to cause any further issues than what you'll have anyway
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Post by gprd on Oct 16, 2019 19:20:54 GMT 1
How much are the weld on adapters?
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Post by muttsnuts on Oct 16, 2019 19:56:20 GMT 1
How much are the weld on adapters? £50 a pair, they are made out of stainless, but can be welded to mild steel no problem |
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Post by 2banger on Oct 16, 2019 20:35:17 GMT 1
Yes Kenny made me some adaptors
They will move the rear mounts a bit , so a bit of adapting will be needed
Have a look on my thread build but they do look OK on the bike
You will need big fook off springs too but TZ ones are long enough :-) I've 3 springs on each pipe and double O ring 👍 |
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Post by gprd on Oct 17, 2019 18:41:17 GMT 1
Yes Kenny made me some adaptors
They will move the rear mounts a bit , so a bit of adapting will be needed
Have a look on my thread build but they do look OK on the bike
You will need big fook off springs too but TZ ones are long enough :-) I've 3 springs on each pipe and double O ring 👍 That sounds reasonable, have you done them with double or single O rings? |
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Post by gprd on Oct 17, 2019 18:49:00 GMT 1
I've 3 springs on each pipe and double O ring 👍 That sounds reasonable, have you done them with double or single O rings? That was meant for Mutts. Trains, tunnels and mobiles aren't a great mix. |
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Post by 2banger on Oct 17, 2019 19:58:52 GMT 1
I've 3 springs on each pipe and double O ring 👍 That sounds reasonable, have you done them with double or single O rings? Yes double O ring in each exhaust onto cylinder super tight fit Using genuine Yamaha banshee exhaust O rings |
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Post by veg on Oct 18, 2019 17:32:39 GMT 1
If you look on my build you can see how and where I drilled my 34 mm carbs so I could run the oil pump, you’ll also need a high flow fuel tap , tap and oil inlets available from Norbo shop.
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Post by markg64 on Oct 19, 2019 13:57:21 GMT 1
If you look on my build you can see how and where I drilled my 34 mm carbs so I could run the oil pump, you’ll also need a high flow fuel tap , tap and oil inlets available from Norbo shop. Wheres you build mate, have you a link. Need to do mine Mark |
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Post by veg on Oct 19, 2019 14:07:35 GMT 1
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Post by veg on Oct 20, 2019 13:06:19 GMT 1
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Post by veg on Oct 20, 2019 13:43:36 GMT 1
Just out of interest why are you running 34 mm carbs?
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Post by markg64 on Oct 20, 2019 13:48:08 GMT 1
It's just the placement I'm after mate. Running 36mm air strikers
Mark
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Post by veg on Oct 20, 2019 14:36:12 GMT 1
If you need the nozzles Norbo has them , I drilled them tapped the holes then used loctite on the nozzles to ensure they were air tight and held.
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Post by markg64 on Oct 20, 2019 15:29:54 GMT 1
Cheers mate, couldn't see them on my phone but laptop shows pics. yes ive ordered the nozzles from Norbo should come this week as he is at stafford
Mark
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Post by veg on Oct 20, 2019 16:04:02 GMT 1
Welcome mark. Enjoy the build.
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Post by markg64 on Oct 28, 2019 21:45:19 GMT 1
Oh i intend to mate !!
Cheers
Mark
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