13 replies to this topic

[markr1]

Hi guys been on here for some time was halfway through a z cars mini a few years back until it was stolen but looking at doing a pro motive kit this time picked up car yesterday solid 89 mini have been in touch with guys at pro motive with a few question about the kit just trying to get hold of a suitable carb r1 engine and loom at moment no doubt I have a few questions along the way will be doing a build diary so watch this space any advice a pointers most welcome

[markr1]

Quick question what year from to did yamaha make the carb version of the r1 engine as seems to be various models knocking about as want the correct one to fit the pro motive frame

[R1mini]

http://www.pro-motiv...=r1-engine-data

 

 

David

[markr1]

Cheers David must be blind did not see it on site

[markr1]

A couple of pics before strip down the only things i be keeping will be wheels seems a shame engine was only rebuilt last year 1275 with 20tho overbore

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[duds100]

Good luck with the builld dude. A few of us have the pro-mo conversion on here so between us we should be able to assist should you require it at any point.

What are you bulding it for? Track or road car?

[markr1]

Cheers bud I am sure I will have plenary on the way building it for road mainly and a bit of track and hill climbing still trying to track down suitable engine at moment

[peter-b]

Just curious as to what they're like to drive 'normally'? In traffic etc, are they grumpy to drive?

[racerlike]

Not got many miles on mine but I found it fine driving around town. gets hot quick but fan does a good job of keeping it in check. Don't need to hold a lower gear either - mini is light so despite a lack of torque it will still pull surprisingly well at lower speeds in a higher gear.

[Helldriver]

Quick question what year from to did yamaha make the carb version of the r1 engine as seems to be various models knocking about as want the correct one to fit the pro motive frame

Why do you want to have a carb version of the R1?

The only advantage is a little bit less electric and price of the engine but a lot disadvantages compared to the 5pw injection version:

- carb has problems with coating of the pistons (major issue with the carb models, especially the 1999 and 2000 versions)

- gear box is less strong (earlier carb version even weaker) and you stress the gearbox with triple weight of the bike in your mini which is the weakest spot on a bec, was uprated on injection

- less power then injection

- you also need all the electronic gadets like power commander as for injection version (and costs that come with that) but have the additional problem/adjustment/modification with the carb needle.

 

If you drive it on the street, search here in the forum for the modification with the belt drive instead of a chain, makes a major difference in noise levels. If the major issue for me with promotive's low ground clearance wouldn't exist I would have also got promotive with this belt modification.

Edited by Helldriver, 29 April 2015 - 11:32 AM.

[markr1]

Never really thought of the injection motor all ways been a carb man myself but now you highlighted some possible issues I take it into account
Cheers for the advice

[duds100]

I find the main difference with injection over a carb`d R1 motor is the superior torque curve. This much improves the way an R1 mini drives on part>full throttle from low to medium RPMs. Plus, no manual choke, and superior fuel consumption. I can get 40mpg from mine on a cruise.

 

IMHO it is worth the extra effort to go 5PW from the start if possible. 

[markr1]

Looks like i am going that route now hopefull getting the engine soon

[Aceslow]

5PW is the way to go for sure